First of all my advice is go for it. Don't let pre-conceptions about age hold you back. In my last job the older engineers were far more talented and productive than the younger fresh-out-of-college or college drop-outs.

Another thought: younger engineers are sometimes preferred simply because they're teeming with naive energy. When I think of hiring someone who I know will spend majority of their time grinding down a mountain of technical debt who do I look for? A naive 20-something college drop-out who will work themselves to the bone for 80k, beer and foosball? Or a 40 year old pro who's been through a successful acquisition, has enough money to not have to work and will figure out in about 2 days how lame the founders are for letting the technical debt grow into such a monstrosity?