I'd had several careers but no degree – then I became a palaeontologist at 62
theguardian.com
theguardian.com
I think a big contributor to inability to do something like that is that I wake up go to work, return home rest a bit, go to sleep and repeat. I always wonder how can someone break out of this cycle if they are too tired after work.
> at 40 he started his own business as a computer sales consultant in Canberra. After 12 years, he sold the company and got the library job