I consider the years between 60 and 70 to be my best opportunity to be active and accomplish my bucket list. Giving up any of those years for FT work would be a sacrifice of what I've been working towards the last 40 years. If I work past 60 in my present situation, I don't think I'll be in any shape to do them after 70. If I retire at 60, I think I will be more active and live a lot longer.
The key factors for my retirement planning are:
55, Age is typically the first year you can collect a pension. Typically you can't work FT in the same vocation to collect without the 59.5 penalty
59.5, Age which you can start withdrawing from retirement accounts without penalty
62, Age which you can start collecting SS
65, Age you can go on Medicare. Need a strategy for healthcare from the time your retire to age 65
65-68, Age at which you can collect SS at full benefit
70, Age where you maximize your SS benefit
70, Age where your required to start taking disbursements from your 401k or TIRA
But that's just the details of your plan. The overriding concern in planning always comes back to how long you think your going to live and how to make the money and time run out at the same moment.