I’m going to try to go full-time up to 72, which is the new cut-off where you have to start taking distributions from a retirement plan. At that point, if I must start taking distributions, I might as well retire and start collecting my maxed-out SS (what remains of it) as well, with the part-time job, of course.
Sounds like you and I are on a similar course. I just turned 60 and still feel like I’m in my 30s health-wise. Even though my 401k is still sitting pretty after the recent downturns in the market, I have no desire to give up my full time job anytime soon and so will keep working for the foreseeable future. I intend to max out my SS as I feel I have a decent shot to make it to 100 or older. That puts me well beyond the break-even point of taking it earlier.