How many guinea pig years are in a human year?

There's no precise conversion for guinea pig years to human years. However, there are general guidelines based on their lifespan:

* First Year: A guinea pig ages quickly in their first year, equivalent to about 18-20 human years.

* After First Year: Each subsequent guinea pig year is roughly equivalent to 6-7 human years.

Example:

* A 2-year-old guinea pig is approximately 34-36 human years old.

* A 5-year-old guinea pig is roughly 60-65 human years old.

It's important to remember these are estimates, and each guinea pig ages at their own rate.