This is something I've been thinking a lot about lately, too.
I love dancing, partying, just being social and meeting people...that atmosphere makes me really happy. And it scares me that in 2 years or whenever, people won't want to come out with me or will look down on me b/c I'm "supposed" to be getting married or settling down. Personally I don't really think there's a specific age for any of that, but if you have no one to go out with, you can bet I won't be doing it much.
I have made a conscious effort to slow down some aspects of my life lately, that's all I'll say about that, but I don't think I'm quite ready to make every night "good book/pot of tea" night just yet