Lots of people change careers for lower pressure / lower hours when they "retire".
My mom was an CFO for a manufacturing company when she decided to retire, within a couple years my sister opened a business and my mom works part time bookkeeping for her. My dad worked for the federal government for 30 years, he retired and still volunteers at least 20-30 hours a week. They both also babysit my sisters' kids 2-3 days a week, which honestly seems harder than any job I'd want ever again.
I've been building a side business for a few years recording drums for other people's music, and when I am no longer at my current job it's my hope that it can tide me over until I hit true retirement age, but I may end up picking up something else in between as well, especially considering health insurance costs.