Convert monkey years to human years. Find out how old your monkey is in human years and which life stage it has reached.
Monkeys and humans share a common primate ancestor, but monkeys age much faster than we do. A typical macaque lives about 25–30 years, while a healthy human can expect to live around 75–85 years. To compare the two, researchers estimate that one monkey year equals roughly 3.5 human years — so a 10-year-old monkey is the equivalent of a 35-year-old human.
This calculator applies that simple conversion to your monkey's age, then estimates how much of its expected lifespan it has completed and which life stage it has reached.
Learning how monkeys age helps researchers study human health, longevity, and age-related diseases.
Knowing your monkey's life stage helps you provide the right nutrition, enrichment, and veterinary care.
Great for classrooms and curious minds — a fun way to compare human and animal lifespans.
| Monkey Years | Human Years |
|---|---|
| 1 | 4 |
| 5 | 18 |
| 10 | 35 |
| 15 | 53 |
| 20 | 70 |
| 25 | 88 |
Note: Chart values are rounded using the formula monkey years × 3.5.