Determining Age

[HeatherW]

I tried searching for an answer to this, unfortunately, I got lots of results that weren't quite what I was looking for, apologies if it's asked over and over!

We adopted two adult male guinea pigs (brothers) a few months ago, through a listing on Freecycle where the original owner said they were about 2 months old. I'm not so sure that was right, and wondered if she made a typo, but when I tried to email back a few weeks later, the email address was no longer valid.

So, are there any physical hints to how old a guinea pig is? (Well, beyond the obvious, they're adult males with fully developed testicles.) Any help would be appreciated.

 

[this_lil_piggy]

Their weight and their nails can give you good clues of an approximate age, but it isn't an exact science and will only help you determine an age range at best.
Go this page Guinea Lynx :: Weigh Weekly! and have a look at the weight charts that are linked there.
Also, have a look at this page Guinea Lynx :: Cavy Feet and Foot Problems

 

[Jenah]

I have had the same questions and frustration over not finding a more exact science, HeatherW! All we can do is our best guesses - unless the piggies were born in our homes. [Mine weren't]