
Just my opinion, but there are tons of ways to find meaning, e.g. advising startups, angel investing, teaching, giving talks at your alma mater, generally helping people in different ways. It's not for everyone, but lots of people have kids and find meaning through them. You can also do stuff for your parents. Looking back on it, I wish I had just paid for a home improvement project at my parents' house rather than simply suggesting it to them and hoping they'd do it.
I plan to read it in a few years when I have my own mid-life crisis.