Dog Age Calculator
Convert your dog's age to human years using the modern epigenetic-age formula from a 2019 UC San Diego study — human_age = 16 × ln(dog_age) + 31. More accurate than the old "multiply by 7" myth.
Human-age equivalent
56 yrs
Life stage
Mature adult
Based on Wang et al. (Cell Systems, 2019) — DNA-methylation epigenetic clock. Results are approximate and vary by breed.
Why this formula beats "multiply by 7"
The 7× rule treats dog aging as linear — but dogs aren't humans with a constant 7× speed-up. Dogs reach reproductive maturity by their first birthday (roughly equivalent to a 15-year-old human in DNA methylation terms), then their aging slows down. A 1-year-old dog is closer to a 30-year-old human than to a 7-year-old, and a 13-year-old dog is closer to 73 in human-age terms than to 91.
That difference matters clinically. A 10-year-old large-breed dog is firmly senior and benefits from twice-yearly exams plus annual bloodwork. A 5-year-old dog under the old rule "should" be 35 (mid-life), but under the modern formula is closer to 57 — a useful prompt to start senior-care planning earlier.
Approximate breed-size adjustments
The epigenetic formula uses an average curve. In reality, size meaningfully changes life expectancy:
- Small breeds (under 20 lb): typically 14-16 year lifespan. Senior status by 9-10.
- Medium breeds (20-50 lb): typically 12-14 year lifespan. Senior by 8.
- Large breeds (50-90 lb): typically 10-12 year lifespan. Senior by 7.
- Giant breeds (over 90 lb): typically 7-10 year lifespan. Senior by 5-6.
Talk to your veterinarian for breed-specific senior care timing. A licensed RexVet veterinarian can help via telehealth in FL, NY, and VA.
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