Portal 2 Co-Op XBox Live, looking for a partner that isn't a toddler

I joined years ago for a similar reason, got deployed, forgot about my account. I can't seem to find a listing of members who want to play co-op with people who are old enough to enjoy a drink and share a bed with their loved one.

Just tried playing with a random friend and wound up playing with a 9 yr old for 30 minutes. It just feels wrong, as I spent more time in the military than this kid had been alive. Having recently finished the single player storyline, I'm looking to play through the co-op. Does anyone know how or where to go to build up some friends my age, or where to find an index of players that don't sound like some mysterious cross between a toddler and a swearing sailor? I guess message me if you want to play co-op sometime.

The 9 yr old was surprisingly polite, I'm guessing his mom is letting him play Portal 2 because there isn't any gore. I cracked up when he got upset and said "This frigging sucks! I died again! Sorry." While it was cute, after answering some fundamental questions as to why the "computer was testing us, obviously the portals work" that the test is our ability to solve the puzzle, I was a bit disturbed that I unwittingly assisted in the raising of a 9 yr old. Made me wonder whether parents should be a bit more cognizant of how online gaming works. This kid could have been playing with some disenchanted bad influence and his mother never would have known.