Dog Age in Human Years
4.0 dog years ≈ 53.2 human years · Adult
Equivalent human age
53.2 human years
Modern (DNA methylation)
53.2 yrs
Traditional (AVMA)
34 yrs
Prime years — fittest and most active.
Step-by-step calculation
Formula
Modern: human_age = 16 × ln(dog_age) + 31 (Wang et al, Cell Systems 2020). Traditional: 24 yrs for the first 2 dog years, then 4-7 human years per dog year by size.
- 1Dog age: 4 years, size: medium
- 2Modern formula: 16 × ln(4) + 31 = 53.18 human years
- 3Traditional AVMA: 24 + (4 − 2) × 5 = 34.0 human years
- 4The two formulas often disagree — modern epigenetic is based on DNA aging markers, AVMA is observation-based.