slightly different situation but I started working NS last year at 38. 40 this year!! I fly with a few Captains who are a fair bit younger than myself and it'll be years before I can get the chance at command, if ever. Offshore was something i'd never even considered. At least offshore you can, in theory, keep flying till you're 65 multicrew.
The question is, would it be better to not try and always wonder if you could have done it, or have a go and maybe get lucky. Just remember one thing, this life isn't a practice run, it's the only one you'll get. Fill it with as much as you can. It can end in an instant!
Good luck.
ps, if you have it in writing, take them to court with an age discrimination case, you old biffer!! LOL (just kidding)