Man, I thought this was going to be an interesting list of things like Depends that old people have to buy and cost a lot.
Depends
Barber/Hairdresser (no way am I going to be cutting my hair at age 75)
Denture glue
Seriously though, pre-MMM, H would sometimes freak about how we needed to save enough to have 100% of our current income in retirement. Then I would remind him that we were already saving ~20% to retirement, plus house payments that would be done by then. So really, we were already living at ~80% of income or less. And at this point we are living at about 50% of income.
If living off 70% of your income in retirement is a big pinch, then either you weren't saving at all, or you get a pension. There are older teachers that I work with who "can't retire" for that reason- cry me a river.