There's certainly no problem with the pension, you can get a British pension paid out pretty well anywhere in the world (presupposes a decent banking system). However, I woud definitely get some professional advice as far as
health insurance is concerned, as that could be a major problem. I'd start off by asking at the local AOK office, but you may hit the problem there, that the "gesetzliche" won't take you in if your already a pensioner unless you've been "gesetzlich" insured for two-and-a-half out of the previous five years.
That leaves private insurance. As a rule of thumb you can say that the insurance premium increases with
the age at which you take up the insurance. I got into my insurance company when I was just over 40 and I'm now paying over €550 / month. If you enter the system at 60 it wouldn't surprise me in the least to see a preium of €1000 being required.
Like I said - you need serious professional advice here!