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Guinea Pig Age Calculator – Guinea Pig Years to Human Years

Estimate your guinea pig’s age in human years with this guinea pig age calculator, based on a typical guinea pig lifespan.

My tools →
Animal
years
months
Size (adult weight)

Small < 9 kg (20 lb) · medium 9–23 kg · large 23–41 kg · giant > 41 kg (90 lb)

Human years

–

Based on DNA methylation research in Labrador retrievers (UC San Diego, 2019). It ages young dogs faster than the classic chart.

Runs in your browser – your data never leaves your device Also available via our free API

Guinea pig age chart in human years

Animal age Human years
0.5 years 6.7
1 year 13.3
2 years 26.7
3 years 40
4 years 53.3
5 years 66.7
6 years 80
7 years 93.3
8 years 106.7

Estimate based on a typical lifespan of 6 years compared with a human lifespan of 80 years. Individual animals vary.

How to use the Guinea Pig Age Calculator

  1. 1 Choose the animal.
  2. 2 Enter its age in years and months (for dogs, also pick the size).
  3. 3 Read the age in human years and the matching life stage.

How long do guinea pigs live?

Guinea pigs typically live 5 to 7 years, and some reach 8 or more. The calculator uses a lifespan of 6 years, which means one guinea pig year corresponds to roughly 13 human years. A three-year-old guinea pig is therefore middle-aged.

Life stages

Guinea pigs are born fully furred with their eyes open and are weaned after about three weeks. They are fully grown at around 14 months and are generally seen as seniors from about 4 to 5 years old.

Helping your guinea pig age well

Guinea pigs cannot make their own vitamin C, so fresh vegetables or a vitamin C supplement are essential throughout their life. Unlimited hay keeps their constantly growing teeth worn down, and they are social animals that are happiest with at least one companion.

Frequently asked questions

How old is a 3-year-old guinea pig in human years?

About 40 human years, based on a typical lifespan of 6 years.

When is a guinea pig a senior?

Usually from about 4 to 5 years of age.

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