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Free age gap calculator for romantic, friendship, work, and family pairs. See years between ages, % of younger and older age, half your age plus seven (romance), life-stage match, and an educational age-gap index — not medical or legal advice.
Last updated: May 24, 2026
Want month/day precision and celebrity tables? Age difference calculator
Age gap
5 years
20% of younger (25) · 16.7% of older (30)
Social band
Common
Younger life stage
Adult (25–34)
Age-gap index (educational)
90/100
Not a clinical compatibility test — combines gap size & life-stage match
Guidance
Moderate gap — may differ on music, tech habits, or career pace; complementary experience is common.
Romantic pair sits inside the half+7 band for the older partner — one social heuristic only.
For exact birth-date math and famous-couple tables, see our age difference calculator.
Focused on relationship context, not just subtraction — how the gap reads socially and which life chapter each person is in.
Default 25 & 30 → 5 yr · 20% of younger · 16.7% of older.
Common — Typical in dating and marriage data — low friction in most cultures
90/100 · half+7 in range · Emory band 5–9 years
Ages 25 & 30 → 5 years · index 90/100 · half+7 range 22–46 (inside)
Gap
5 yr
Index
90
% younger
20%
Life stage
Match
Age gap = |Age₁ − Age₂|% younger = (gap ÷ younger age) × 100 · % older = (gap ÷ older age) × 100Index ≈ 100 − (2 × gap) − (15 if gap > 10) − (10 if different life-stage bucket)Half+7 min = (older ÷ 2) + 7 · max = (older − 7) × 2| Gap | Romantic | Friendship | Notes |
|---|---|---|---|
| 0–2 years | Very common | Very common | Peers — same school/work cohort often |
| 3–5 years | Common | Very common | Default example (25 & 30) sits here |
| 6–10 years | Moderate | Common | Different micro-generations possible |
| 11–15 years | Notable | Moderate | Plan life-stage topics early |
| 16+ years | Large | Varies | Half+7 and power-balance awareness matter in romance |
| Gap | Rate cited | Notes |
|---|---|---|
| 0–1 years | ~3% | Lowest band in Emory sample — often similar life stage |
| 2–4 years | ~5–7% | Still among the more stable ranges in aggregate data |
| 5–9 years | ~18% | Moderate gap — communication and priorities matter more |
| 10–14 years | ~39% | Larger generational span — plan for life-stage talks |
| 15–19 years | ~43% | High variance; many couples still thrive |
| 20+ years | ~95% | Rare in sample; not a prediction for any one couple |
Gap 5 yr · index 90/100 · half+7 22–46 · Common socially · research 5–9 years.
28 & 30 (2 yr)
Index 96 · Very common
25 & 45 (20 yr)
Index 35 · outside half+7 · 20+ years
22 & 35 (13 yr)
Index 49 · band Notable (friend mode)
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