Dog & Cat Age in Human Years — Epigenetic Clock Formula + Life Stages
Calculate dog and cat age in human years with the NIH epigenetic clock formula. Includes AAHA/AAFP life stages, size-adjusted aging, and reference milestones.
Dog & Cat Age in
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Traditional (×7 Method)
36 human years
Life Stage
Adult
Scenario Comparison
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Dog
5.0 years old
small breed
Life Stage
AdultHuman Age Equivalents
Age Milestones
| Dog Age | Traditional Human Age | Epigenetic Human Age |
|---|---|---|
| 1 yr | 15 yrs | 31.0 yrs |
| 2 yrs | 24 yrs | 42.1 yrs |
| 3 yrs | 28 yrs | 48.6 yrs |
| 5 yrs | 36 yrs | 56.8 yrs |
| 7 yrs | 44 yrs | 62.1 yrs |
Why the ×7 Rule Is Inaccurate
The traditional "multiply by 7" rule assumes aging is constant, but dogs age much faster in early years. A 1-year-old dog (~31 human years) is reproductively mature — equivalent to a young adult human, not a 7-year-old child. The NIH 2020 epigenetic study revealed that dog aging follows a logarithmic curve: rapid early development that decelerates with age.
Life Stage Chart — Dog
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