How Old Are Kourtney Kardashian’s Kids? (2026)

By Maria Gonzalez · January 28, 2026

Why This Question Matters More Than You Think

If you’ve ever typed how old is kourtney kardashian kids into Google, you’re not just scrolling for trivia — you’re likely comparing your own child’s pace, wondering if their speech, independence, or emotional regulation lines up with peers, or quietly seeking reassurance that ‘normal’ has wide margins. Kourtney’s three children — Mason (born 2012), Penelope (2014), and Reign (2018) — have grown up under a global spotlight, but their developmental arcs mirror those of millions of kids navigating school transitions, sibling dynamics, digital immersion, and identity formation. In this deep-dive guide, we move far beyond birthdates to unpack what each age truly means in practice: what cognitive leaps happen at 6 vs. 10, how emotional scaffolding shifts from preschool to preteen, why Reign’s current age (6 as of 2024) demands different boundaries than Mason’s teen years — and how pediatric experts translate those years into actionable, non-judgmental guidance you can use right now.

Mason, Penelope & Reign: Birthdates, Ages & Developmental Context (2024)

Kourtney Kardashian shares three children with Scott Disick. Their births span six years — a timeline that offers a rare, real-time window into how parenting evolves across developmental stages. As of June 2024:

Mason Disick: Born December 14, 2012 → 11 years, 6 months old. Entering early adolescence — physically changing, socially recalibrating, and developing abstract reasoning.
Penelope Disick: Born July 8, 2014 → 9 years, 11 months old. Solidly in middle childhood — mastering academic skills, forming deeper peer bonds, and refining moral reasoning.
Reign Disick: Born September 15, 2018 → 5 years, 9 months old. Just starting kindergarten — building foundational literacy, self-regulation, and social cooperation.

This spread isn’t just biographical detail — it’s a living case study in developmental sequencing. According to Dr. Sarah Lin, a developmental pediatrician and faculty member at Stanford Children’s Health, “When parents observe siblings or public figures across age bands, they’re often subconsciously calibrating expectations. But chronological age is only half the story — neural wiring, temperament, environment, and even sleep hygiene shape readiness more than birthdays alone.” That’s why we’ll go deeper than dates: we’ll map each child’s current stage to concrete behaviors, challenges, and science-backed support strategies.

What Each Age Means: From Brain Science to Bedtime Routines

Let’s move beyond labels like ‘tween’ or ‘preschooler’ and ground expectations in neurodevelopment. The American Academy of Pediatrics (AAP) emphasizes that brain maturation isn’t linear — it’s layered, with prefrontal cortex development (responsible for impulse control and planning) continuing into the mid-20s. Yet key windows open and close earlier. Here’s how that plays out across Kourtney’s kids’ current ages:

Mason (11.5 years): The Preteen Pivot Point

At 11½, Mason is experiencing rapid synaptic pruning — his brain is strengthening frequently used neural pathways (like gaming reflexes or debate logic) while shedding less-used ones. This explains why he may seem inconsistently mature: brilliant during chess club but forgetful about chores. Dr. Lin notes, “This isn’t laziness — it’s neuroplasticity in action. Parents who frame responsibility as *co-created systems*, not top-down rules, see better follow-through. Example: Instead of ‘Clean your room,’ try ‘Let’s design a 5-minute reset routine together — what 3 things make your space feel calm?’”

Penelope (9 years, 11 months): The Empathy Accelerator

Penelope is entering what researchers call the ‘moral reasoning leap.’ She’s moving beyond ‘rules are rules’ to questioning fairness, noticing social inequities, and feeling others’ emotions viscerally. A 2023 University of Michigan longitudinal study found children aged 9–10 show a 40% increase in perspective-taking accuracy compared to age 7–8. Translation: When she argues about sharing snacks or calls out a classmate’s exclusion, she’s exercising critical social muscle — not being ‘bossy.’ Support her by asking open-ended questions: ‘What do you think made them feel left out? What’s one small thing you could do next time?’

Reign (5 years, 9 months): The Kindergarten Readiness Inflection

Reign’s age places him squarely in the ‘executive function bloom’ phase — where working memory, flexible thinking, and self-control begin consolidating. But here’s what rarely makes headlines: 30% of kindergarteners still struggle with sustained attention for >15 minutes (National Center for Education Statistics, 2023). Reign may excel at storytelling but melt down during circle time — not due to defiance, but because his inhibitory control circuits are still myelinating. Pediatric occupational therapist Maya Chen recommends ‘micro-transitions’: “Give a 2-minute warning before switching activities, then a tactile cue — like handing him a smooth stone to hold — to anchor attention. It’s not coddling; it’s neurologically responsive scaffolding.”

The Hidden Curriculum: What Celebrity Parenting Reveals About Real-World Expectations

Kourtney’s public parenting choices — from Reign’s Montessori preschool to Mason’s involvement in her lifestyle brand Poosh — reflect intentional alignment with developmental science. But what’s *not* visible matters more: the unglamorous work behind the scenes. Let’s demystify three high-impact, research-backed practices modeled (intentionally or not) across her kids’ ages:

Emotion Coaching Over Correction: When Penelope posted a tearful TikTok about friendship drama at age 9, Kourtney responded not with advice, but validation: “It makes total sense you’d feel hurt. Want to talk through what happened?” This mirrors John Gottman’s emotion coaching framework — proven to boost children’s emotional intelligence by 27% over 2 years (Gottman Institute, 2022).
Autonomy-Supportive Scaffolding: Mason, now 11, co-hosts Kourtney’s podcast segment ‘Mindful Minutes.’ Rather than scripting him, she prepares talking points *with* him — letting him choose which mindfulness exercise to demo. This embodies Deci & Ryan’s Self-Determination Theory: competence + autonomy + relatedness = intrinsic motivation.
Ritualized Reconnection: Multiple interviews reveal Kourtney prioritizes ‘device-free dinners’ — no phones, no tablets, just conversation. Research from the Harvard School of Public Health links consistent family meals to 24% lower risk of disordered eating and 18% higher emotional resilience in children aged 6–12.

Age-Appropriate Screen Time & Digital Literacy: Beyond the AAP Guidelines

The AAP recommends no recreational screen time for children under 18 months, high-quality programming with caregiver co-viewing for 18–24 months, and consistent limits thereafter. But in 2024, ‘limits’ need nuance. Consider how Kourtney’s kids engage with tech:

Child’s Age & Stage	Digital Behavior Observed	AAP-Aligned Strategy	Real-World Implementation Tip
Reign (5 yrs, 9 mos) Early Kindergarten	Watches short YouTube videos (e.g., animal facts); uses tablet for drawing apps	≤1 hr/day high-quality programming; co-viewing essential	Create a ‘screen choice board’: 3 pre-approved options (e.g., National Geographic Kids video, PBS Kids art app, Duolingo ABC). Let him pick — builds agency within boundaries.
Penelope (9 yrs, 11 mos) Upper Elementary	Uses Instagram (via parent-controlled account); creates TikTok-style videos with friends	No unsupervised social media; emphasize digital citizenship	Host monthly ‘Digital Dinner Nights’: Watch one short video on online privacy together, then discuss: ‘What would you do if someone asked for your address online?’ Role-play responses.
Mason (11 yrs, 6 mos) Early Adolescence	Plays competitive online games (Fortnite, Minecraft servers); edits videos for Poosh	Focus on critical evaluation & balance; prioritize sleep hygiene	Implement ‘Tech Sunset’: All devices charge outside bedrooms by 8:30 PM. Use a physical alarm clock. Backed by NIH sleep research showing teens need 8–10 hours — and blue light suppresses melatonin for 90+ minutes.

Frequently Asked Questions

How old is Kourtney Kardashian’s youngest child?

Reign Disick was born on September 15, 2018. As of June 2024, he is 5 years and 9 months old — just completing his first year of kindergarten. His age places him in a critical window for developing foundational social-emotional skills, fine motor coordination, and phonemic awareness — all best supported through play-based, low-pressure learning rather than academic drilling.

Is Mason Disick in high school yet?

No — Mason Disick, born in December 2012, is 11 years and 6 months old as of June 2024, placing him in 6th grade (the final year of elementary or first year of middle school, depending on district structure). He will enter 7th grade in Fall 2024. While some media outlets mistakenly report him as a teen, he remains developmentally in late childhood — a period where peer influence intensifies but abstract reasoning is still emerging.

Do Kourtney’s kids attend the same school?

No — Kourtney has intentionally chosen different educational paths aligned with each child’s needs. Mason and Penelope attended private Montessori-inspired schools through elementary, while Reign began at a progressive public magnet kindergarten program focused on project-based learning. This reflects a growing trend among informed parents: rejecting ‘one-size-fits-all’ schooling in favor of matching pedagogy to developmental readiness — a practice endorsed by the National Association for the Education of Young Children (NAEYC) for optimizing engagement and reducing behavioral referrals.

What’s the age gap between Kourtney’s kids?

The age gaps are: Mason to Penelope = 1 year, 6 months; Penelope to Reign = 4 years, 2 months. This spacing creates distinct sibling dynamics — Mason and Penelope share many early memories and overlapping peer groups, while Reign experiences more ‘only-child-like’ attention during preschool years before integrating into older siblings’ worlds. Research in the Journal of Family Psychology (2023) shows 4+ year gaps correlate with lower sibling rivalry but require deliberate bridging activities (e.g., shared cooking projects) to foster connection.

Does Kourtney Kardashian follow strict parenting rules?

Publicly, Kourtney advocates flexibility over rigidity — calling her approach ‘mindful consistency,’ not ‘strict discipline.’ She’s spoken about adjusting bedtimes during travel, allowing Penelope to choose her own clothes (even mismatched ones), and letting Mason negotiate screen time in exchange for completing chores. This aligns with attachment research showing that warmth + clear boundaries — not inflexibility — predicts the strongest long-term outcomes in academic achievement and mental health.

Common Myths About Celebrity Parenting Timelines

Myth #1: “If Kourtney’s 5-year-old does X, my child should too.” — Reality: Developmental readiness varies widely. Reign attending a Montessori preschool doesn’t mean your 5-year-old must master cursive writing. The AAP stresses that kindergarten readiness hinges on social-emotional skills (sharing, following 2-step directions) far more than academic precocity.
Myth #2: “Older siblings automatically become mentors.” — Reality: While Mason occasionally joins Reign’s playdates, forced ‘teaching’ backfires. Child psychologist Dr. Elena Torres notes, “Peer teaching only works when the older child chooses it — and feels competent. Pressure creates resentment, not leadership.”

Your Next Step: From Observation to Action

You now know exactly how old Kourtney Kardashian’s kids are — but more importantly, you understand what those ages signify in terms of brain development, emotional needs, and practical parenting leverage points. Don’t compare your journey to a curated highlight reel. Instead, pick *one* insight that resonates most: maybe it’s Reign’s ‘micro-transition’ technique for smoother mornings, Penelope’s empathy-building question prompts, or Mason’s co-designed responsibility system. Try it for 7 days. Track what shifts — not in perfection, but in connection. Because great parenting isn’t about matching celebrity timelines; it’s about meeting your child, right where they are, with grounded science and unwavering presence. Ready to build your personalized plan? Download our free Developmental Stage Snapshot Guide — a printable checklist matching ages 4–12 to observable behaviors, red-flag indicators, and 3 immediate actions you can take today.