Well, this conversation certainly got the blood flowing in our old, broken down 60-something bodies. I hope the OP is still reading some of these posts and hasn't tuned out due to the many old person responses. Our first diving trips were with young kids so we split up, one played on the beach with the kids while the other dived. Since the kids got certified and then left the nest, what has made diving as special as it is for me is that my wife is as enthusiastic about diving as I am. We like the groups we travel with (just had dinner last night with a just tuned 40 couple we met in one of the groups) and having my spouse as my dive buddy makes everything outstanding. To the OP, join Scuba Meet Up groups in your area (we have at least one in Chicago), get to know dive shops in your area and then join some trips with those groups that you can find a few age-appropriate pals. It is hard if you're 20-something and everyone else is 50+. But, find the right group that is diverse in age in your hometown and go diving with them.
Rob
Rob