Maybe the guy is free as a bird and looks at is as a new adventure.

Good luck sir! If this is what you want to do, it is certainly possible. True you'll need to get back into the game, but that shouldn't be terribly difficult in this climate. Start where you can and work your way up just like you would if you were 25 and not 50. By the way, the comment about the Majors not hiring guys in their 50's is bunk! They do it all the time.

When I was a regional CA I flew with a hand full of FO's on their second career, well into their 50s, who always toyed with being a 121 pilot and just had to go for it. Enjoyed them greatly, and they did a fine job.

And as far as the "commitment to the career" worry. Sure might be a bigger hurdle to get an interview, but once you do, you'll have a fair chance of satisfactorily explaining your reasons. If you're likable, prepared, and presentable you'll probably get the nod, and if not then, keep trying, it will happen for you, no doubt about it.