I'm 46 and on my 4th founding engineering team. Coding every day, learning new frameworks with each new role. Home for dinner every night with my kids. My coworkers and I are all in the same age range, we've circulated from one startup to the next, some quite lucrative, others flame out, but no one ever questions our abilities. Don't work for the man, especially when the man is just a boy.
Don't work for the man, especially when the man is just a boy. Hah, I love it. Then again, working for older people that think they know something just because old is equally tiresome.
Seriously, though, my boss, the CEO of the company I'm a co-founder on, is 25 years younger than me. He's not a boy, though he has boyish good looks. (Can't get him to keep the beard.)
There are a lot of boys running startups in the Bay Area, and it's true most of them are younger, because if you don't have wisdom or common sense, time tends to give it to you. So those who will learn do, when they've had enough experience.