Get a Midlife
nytimes.com
nytimes.com
I don't necessarily know what it would be, but I'd take the results of the poll with a grain of salt, especially considering this contradictory link.
I asked my wife's grandfather on his 88th birthday: Forget the mirror, how old do you feel on the inside? His answer: 33.
As a 48 yo, I gotta tell you I wouldn't believe I'm mentally past 22 without the mirror. But maybe that just means I'm incredibly immature. :)
Additionally, you've probably passed through the various stages of being motivated by wanting to impress women, by wanting to gather materialistic wealth (and fast), by wanting to impress your peer-group, older founder is now doing it for more intrinsic reasons which makes for sustainable long-term motivation and commitment.
I say this as a 30 y.o guy who's currently learning how to code (previously a product manager at BigCorp) so I can build my own project this year. Sometimes I think to myself I wish I did this earlier but then I realise that the sum of my life experience has put me where I am now.