How long do guinea pigs live?

Short answer: about 5–8 years on average, and some well-cared-for guinea pigs live beyond 8.

1. Diet basics — unlimited hay, fresh daily vegetables with vitamin C, measured pellets.

2. Environment — 18–26°C, dry bedding and plenty of floor space.

3. Company — they are social animals and thrive with a companion or daily interaction.

4. Regular checks — weekly weighing, annual vet visits, every six months after age 4.

5. Life stages — adult by about 1 year; senior from 4–5 years, when teeth and joints need extra attention.