How many parties do your parents go to? When you went to parties when you were younger, were there a lot of 50 year olds hanging around?
I know as I've gotten older (still younger than OP but well on my way), my tastes have changed and mellowed. Gone are the days where me and my friends want to be in a noisy, booze-filled environment. Dining out, theatre trips, hiking, even an international holiday with friends to take part in a running event. Just no parties.