I would say older than that, seeing as the other day I saw on TV about gay animals. Not joking, but actual animals that form homosexual relationships.
________ HERBAL VAPORIZERS
There's even a mutation found in fruit flies that makes males join in single-sex mating dances.
I've heard too many stories about people jumping through hoops to hide their preference from their community to say it is a national or religious phenomenon.
I think being gay predates both the concept of nation and organized religion.