Retirement seems like a strange concept to me. In common parlance it’s when you have a full time plus job (which you often hate) and then at 65 stop working altogether.
I’m 72 but a consultant and I work on projects I love but not fulltime. I am constantly learning. And, I do lots of things besides work - gardening, baking, local probono projects, time with family and friends. My health and brain are good and I care so much about the future of the world - why would I stop doing work with others to co-create a world where all can thrive? I may gradually slow down… but expect to continue my work until I die.
My main financial strategy is to live very simply. I’m setting up a solo 401K (see https://www.thenextegg.org) so I can invest my retirement funds locally and in other social change projects.