Instead of buying from an exotic pet store I would highly reccomend a rescue or rehome- check craigslist.com in your area under pets or see if someone on here knows of a rescue near you. The ONLY limitation on a gliders ability to bond with you is the amount of time you have to dedicate to them. Age means nothing. If you put in the time, you will get the results.
Who's to say Pocket Pets or some other glider mill is not the source for the exotic pet store you got your chin from? You can never tell. There are so many sweet suggies in need of a home already :-(