Horses commonly live to be 25 – 35 years old, and horse ages translate into human ages almost linearly, but with major differences in age equivalents as babies where mature at a rate far faster than humans, reaching pony puberty by age two:
Horse age Human age
1 year 6 years
2 years 13 years
3 years 18 years
4 years 20 years
5 years 24 years
7 years 28 years
10 years 35 years
13 years 43 years
17 years 53 years
20 years 60 years
24 years 70 years
27 years 78 years
30 years 85 years
33 years 93 years
36 years 100 years