PLEASE I NEED YOUR HELP

[Mike Dolan]

I had two gerbils in a single tank and the father recently passed away and I
know that a gerbil cannot stay alone or their lifespan will decrease. He is
one year old and a little heavy and he looks to be eating less. I need help
on what kind of a gerbil I could introduce him to. Should it be one his age
or younger? I am just completely clueless. The women at the pet store said
that it was better to get an older one but I didn't think so. Please help me
out on this before it is to late. Any response on my situation will be
greatly appreciated. Thanks