It's good to have some life experience behind you, and I know loads of guys who only started flying after several years in another profession (including myself). Aviation is a very fickle industry and far from secure. Having something to fall back on if required is very valuable in this day and age.
The other thing which it does do, is make you appreciate your flying job alot more. I'd hate to go back to the Mon-Fri 9-5 rat race, but at least I could to keep a roof over my head if I had too! Theres an awful lot of pilots who no nothing else other than how to get an aircraft from A to B.