I went part time 6 years ago at 60 years old. Currently not adding any to my savings but meeting my expenses. I haven't figured out an ideal fitness regimen, but there's a LOT less stress about work. No management stuff, no performance evaluations, no business metric analysis, no worries about utilization. It's also been a good way to transition to full retirement next year sometime, when I will focus on fitness and health and volunteerism.