What Are the Usual Rules for Senior Chat Rooms?

Although I have used computers and the internet a lot for work, I haven’t really used them for social purposes before. I decided it is time I give this a try since I have been a bit lonely lately. Can anyone tell me what the rules usually are for senior chat rooms? What can you do and what can’t you do, and how old do you need to be to qualify, or does this change based on the chat room? I hope I can find some people that have similar interests to me so I can get more of a social life now that I am not working full time anymore.