https://hbr.org/2018/07/research-the-average-age-of-a-succes...
https://www.businessinsider.com/companies-started-middle-age...
Unless you have physical or mental disabilities brought on by aging, I don't see how your age would have anything to do with it. Either you can build a successful business or you can't. Since prior experience and connections and accumulated skills will play into that, you have some advantages over someone half your age.
I will turn 62 this year, and I'm enjoying the most lucrative and interesting stage of my long career in software. Other than the ham-fisted age discrimination people our age might encounter at job interviews I don't see any impediments.
I'm 70 and working on my fourth startup. If you're bootstrapping like me then you don't need permission from anybody. It doesn't matter if you can't get into a favorite startup accelerator or raise venture capital because of your age.
I like hard challenges. I've seen far too many people retire and a few years later they're dead. My late father did volunteer work full time after 70 and he didn't stop until 95 when health issues slowed him down.
Whether I taste success or fail there will be a fifth startup in my future I promise you.
The only data that would be relevant to you is whether or not you can do it. And the most relevant fact to consider is whether or not you want to do it.
Have you fulfilled your professional purpose or not? If so, enjoy your retirement. If not, keep going.
You don't mention this option, but if the kind of work that running a company requires doesn't appeal to you, joining another company might be a path. You could also hire a CEO and become an employee of your own company.
But you already had a software company and it "fizzled out" and you got burned out.
So more importantly, have you learned anything from that, and how will you do things differently this time? (That's a rhetorical question for you to ask yourself)
As I see it, you have solid past experience and secure financial foundations. So the question is really more about motivation. If you still enjoy programming and the selling process a business requires to re-start, then why not?
Are there other persons involved? Family or friends who are trying to talk you out of it? Is there something else that you are equally interested in exploring? like traveling the world, starting a different hobby, moving away from SF, etc?
https://www.forbes.com/sites/kmehta/2022/08/23/older-entrepr...
This really boils down to you, and less about your age.
THIS: Assuming that you're healthy and remain mentally/physically vigorous, answer the below questions authentically:
1. Are you sick and tired of current daily routine and lack of intellectual stimulation? (You're obviously restless, hence posing this question).
2. Have you curated a list of startup ideas that are of interest and within scope of skill-set?
3. Has a restful night of slumber devolved into hours upon hours of visualizing the ONE product that will inspire the drive, discipline and creativity required to build and introducee it to the world?
Go kill it!!
The trick with selling one app is finding a solid niche you can successfully build and productize an app/service for.
I started a company when I was 19, and had no clue what I was doing. There is never a wrong age to start, but as you get older you are more allergic to losing money :)
Most people who do so will skew younger for various reasons.
I don't see any reason why you are doomed to failure; especially if you work on bootstrapping something instead of thirsting after VC cash.
Start anything , make nothing , there is really no correct answer to your throw away question
YES YOU ARE YOUNG ENEOUGH. DO IT!!!!!!!
So what have you got to lose?
But if you want to do it, then go for it. Sounds like you already have the experience.