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- I wish I would have colored my hair earlier. I always thought it was neat but was raised thinking that things like that or tattoos would ruin your job, etc. It's true that times have changed and it's more acceptable now. When my hair started thinning I decided to do it while I still can. I've been "blurple" for a year and I absolutely love it - it's been so much fun. My parents didn't freak, my extended family loves it, and being an introvert it gets me just a enough attention for a dopamine hit without freaking out.

- Register to donate bone marrow. I didn't donate blood for ages and didn't register for marrow until my 30s. I matched a leukemia patient, did a harvest and we had a successful transplant. The modern procedure is non-surgical and stem cell based. There was no pain. I later found out that there had been another search in the registry I would have matched for, but I was not registered yet. (That patient did undergo chemo and survived, but the transplant would have been better.)

- Get comfortable talking to people about your feelings. Hire someone to talk to if you don't have someone. As an engineer, if I have a problem with someone I try to logic them through it... but feelings don't work that way. "I don't like X" or "that makes me feel Y" are inputs to logical systems even if they are not logical themselves. Many jobs, relationships, etc. would have gone differently. "I am afraid of Z" has helped me in a lot of cases. People just assume I'm tough guy.