Quick Answer
Use the calculator below to find your mouse's age in human years. The old "multiply by 7" rule is inaccurate — aging varies by size and breed.
How Old Is My Mouse in Human Years?
Pet mice live just 1-2 years, one of the shortest lifespans of any pet. They mature incredibly fast and are considered senior by 1 year of age.
With proper care, many mouses exceed this average.
📊 Mouse to Human Age Conversion Chart
| Mouse Age | Human Equivalent | Life Stage |
|---|---|---|
| 1.2000000000000002 months | ~8 human years | Baby |
| 3 months | ~15 human years | Juvenile |
| 6 months | ~30 human years | Adult |
| 1 year | ~50 human years | Mature |
| 1.5 years | ~70 human years | Senior |
| 2 years | ~90 human years | Geriatric |
🐾 Mouse Life Stages
Pinky
0-2 weeksBorn hairless, blind, and dependent on mother.
Juvenile
2-6 weeksEyes open, fur grows, weaned at 3-4 weeks.
Adult
6 weeks-12 monthsActive, social, breeding age reached quickly.
Senior
12 months+Slowing down, fur thinning, tumor risk increases.
💚 How to Help Your Mouse Live Longer
Proper Housing
Well-ventilated cage with deep bedding. Avoid cedar and pine shavings.
Social Groups
Female mice do well in groups. Males are typically housed alone due to aggression.
Clean Environment
Ammonia from urine causes respiratory disease. Clean regularly with dust-free bedding.
Varied Diet
Quality mouse food plus small amounts of fresh foods. Avoid overfeeding seeds.
Gentle Handling
Regular, gentle interaction reduces stress and helps spot health issues early.
Lifespan by Mouse Breed
Different breeds have different lifespans. Click for breed-specific aging info.
Frequently Asked Questions
How long do pet mice live?▼
Why do mice die so young?▼
How do I know if my mouse is old?▼
Track Your Mouse's Health Journey
Get age-appropriate care reminders, vet schedules, and health tracking for your mouse.
Trusted sources: AVMA Pet Care · UC San Diego Aging Study