From full time work? As soon as you can afford to (my goal is 59.5.. the date I can start drawing down on my IRA without penalty)
But to stop working altogether? That’s a bad idea. At 60, you’ve still got a solid 15-20 years ahead of you were you can get aroud without assistance, so some type of part-time work (even if its as a volenteer) is crucial to keep your sanity.
Face it. By the time you’ve made it to that age, you’re up at dawn anyways. What are you going to do all day.. fight with your spouse? Best bet is to have a place to escape to. Plus, you get a half fare transit card, so how can you lose?!