Can You Tell How Old Hamsters Are? If So, How?

[Creampuff]

Hi everyone,

I know I probably come up with the stupidest questions, but can you tell how old hamsters are? If so, how? When I got my hamster at Petco, I forget to ask how old she was. I've had her for approx. 7 and a half months now. I know she's that much older, but I don't know how old she is.... I'm guessing she's probably coming up on her 1st birthday? I would like to know, but is there a way to find out how old she is?

Thank you!