Gerbil Age

Question
I have two gerbils that i got two months ago, but the woman at the pet store didn't tell us how old they were? is there a way to tell? One of the is a lot bigger than the other one. Could they still be the same age?
Thank you!!
~Noa~

Answer
It's pretty hard to actually tell the exact month. Most gerbils that are in a petstore are generally at least 6 weeks old. They also could be the same age because sometimes you get runts of the litter. :-) The younger the better because male gerbils will seem to accept younger gerbils more readily than if it was an older gerbil.