I’m in my 60s now. I took early retirement after more than 30 years as a teacher, which included 20 years as a Secondary Head (Principal), mainly in Christian schools. Among other things, teaching means working with a team of experts, who love their fields enough to want to help others to learn them. This makes most schools and colleges fascinating places, built on creativity and committed to excellence, where everyone learns and grows.
I benefited greatly from that, always being challenged to develop and grow, learning new skills and understanding.