OTOH, if you were making $200K and the startup insisted you drop to $70K/year, that's just short-sighted on their part. Especially in this generous funding environment it doesn't make any sense to squeeze founders with tiny salaries.
The life stage and family differences are indeed a big gap, but I think the career stage differences would have also been insurmountable. Once you're a decade or two into a career and you have a comfortable position at a big company, it's really difficult to shift back into scrappy startup founder mode.
To be clear: There's absolutely nothing wrong with taking well-paid roles at big companies. It's actually a great option, and it's fantastic that we can get paid so much without taking on the risks of a startup. There's not really a right or wrong answer in this job decision.