The older you get, less close friends you have?

I don't know if it is just me or what. I am 24 years old and I have three jobs. So,I feel like I have less close friends to talk to. I only hangout with my bf whenever I am free. I only hangout with friends like once or twice a month. Also I chat occasionally with friends on facebook chat. Is it like when people are older, they just have their own busy life to deal with and less hangout time? I think it is hard to make new and close friends when you are okder. Help. :(