If you're still playing you can join Inipi, it's run by older and more mature players. I'm 22 but most of the people are in their 30s-40s, maybe older. The guild leader is Livialove and she's a 70/70 M/P, she's also an awesome person! Feel free to hit her up in game and tell her "Morte" or "Mortal" told ya about the guild. They gladly invite anyone older than 18 years of age and you have to be completely drama-free, unless you want a swift kick in the rear.

I just started RoM again and they've been helping me out a lot. If you have vent you can join theirs, even if you don't have a mic. They do daily runs of instances for the higher levels (50+ but sadly I'm only 31/20 right now), they do gobs and a couple others I believe. They do SW nearly every night too. An we don't care if we don't win, cause we have a ton of fun in SW, whether it's cracking jokes about stuff or the way we oddly die by the enemy. (Or in my case how I died by the Balloon things lol) So, feel free to hit her up when you are in game.