I always find it interesting when these sorts of threads are posted. I for one look at them as am I too old to be starting my own company or should I chill out because I still have time.
Fundamentally I think there's limited value in drawing lessons from these stories because you're probably your own best judge of whether you should quit your job or not. Your risk tolerance lowers as you get older but your skills will improve so it's up to you to decide what's the sweet spot. That said there is an age threshold where you'll be treated like an old man at a big company so may as well demonstrate your expertise on your own company before that happens.
Fundamentally I think there's limited value in drawing lessons from these stories because you're probably your own best judge of whether you should quit your job or not. Your risk tolerance lowers as you get older but your skills will improve so it's up to you to decide what's the sweet spot. That said there is an age threshold where you'll be treated like an old man at a big company so may as well demonstrate your expertise on your own company before that happens.