As with most things its down to confidence. When I started punting I generally saw older WG's as I'm in my 60's.
Now I'm more experienced I'm happily seeing girls in their 30's.
Just try to stretch your limits a little at a time, dont put yourself in any situation thats too much for you.
A decent WG wont care, just remember to be clean, smart and polite, in my experience they are the important aspects.