Gonna do it at 65, when the government cheese starts rolling in. Between my wife and me, we will get max Social Security that the system permits, which just alone will cover all monthly mortgage payments, household bills, food, and Medicare supplements. If we followed the conservative 4% rule on our combined retirement and other investment accounts, we would have more income in retirement than we do now while we're working, while not drawing on principal over the long term (historically speaking; who knows?). She's an airline employee, and is already vested in lifetime free flights for us both. We love to travel, and that's what we will do in retirement, without the stress/time hassle/worry about fitting it in with work schedules and issues. We're both quite healthy, but you never know what could come up.