Ask HN: Do startup founders experience midlife crisis?

I was wondering if startup founders are susceptible to midlife crisis? Reason I ask is, it seems many issues that people deal with during their midlife crisis- losing your pride, figuring out what you want out of your career- are things that founders have already gone through or are forced to deal with in the process of doing their startup. Or maybe it's just my youthful ignorance speaking.

Would especially love to hear from folks here who have experienced middle-life.