5M@50. 4M@60, 3M@66. At 50, I will need to buy a house, re-home the Mom's wherever I go, buy them houses and pay off everyones debts. Less say, at 50, I burn through 1M being stupid and setting up for retirement. That leaves 4M @5% return on investment, 200k a year without touching the principal. I can easily live on half that, but I want to be over prepared and not cutting it too close. Once I am fully retired, I am not coming back to work. If I tough it out to closer to 60, more stuff will be paid off(probably all) and I will probably not have the Mom's around. Sell the house. move to the retirement area, buy something smaller and again live off the interest. My goal is to quit full time at 55, the wife will be working again then, and find a second career where I am not tied to emails 24/7. I can probably work for this company as a consultant a day or two a week. Or move out of IL, downshift and work enough to keep busy and fly the snot out of the plane. My grandparents all lived into their 90's, and my mom is in her mid 70's and is going strong. I would guess I would see my 80's.
The above numbers will change if health care changes (money needed and ages).
After 21 years at the same company, retirement is one of my favorite conversations...