Hey, what's the big thing about hitting 30, 40, 50 etc.? After all it's only a number.
You don't need to act a certain way because you're a certain age, there's no need to get depressed about any of it.
Pipe and slippers don't get surgically attached at any time.
A young lady told me on Sunday she would never have thought I was 34, she said I don't act like a 34 yr old (and she wasn't having a go, BTW). Maybe it's because I'm still young enough to have a little fun, and enjoy acting like an arse with my 5 year old.
As Tosh says in his signature, men don't stop playing because they get old - they get old because they stop playing.
So, to summarise, bloody well shut up, go out and have a little fun