Never had a crisis. Aging is a slow process - for me there are plenty of opportunities to realize what's going on and for making adjustments. This is true for health and also personal enjoyment subjects. I am a "family man" and work hard, but I do take time to be selfish. I.e. I have had a "hot" car since my late 20s when I could afford it.
One big thing I want to start is flying. But that I am putting off, because it just is too expensive to do right. Once the kids are finished with their education, I will pull the trigger. Maybe start taking lessons a little earlier. I think that will be the only thing that will look like a symptom of a ML crisis to bystanders.
G