The constant whinging about NHS notwithstanding, I think London is actually a great place to be if you're 65+ and lucky enough to a have a roof over your head.

The constant whinging about NHS notwithstanding, I think London is actually a great place to be if you're 65+ and lucky enough to a have a roof over your head. From what I have seen, senior citizens are very active and proactive -- someone living there a few months a year can end up connecting with a walking group, bird watching group etc, where people are inviting and polite by nature. There's lots of free events, access to large parks and nature is possible using the rail network etc. In the US, senior citizens can be individually active, but I haven't come across the same level of proactive organizational behavior and openness to noobs and outsiders that I have come across in London. The prerequisite for such a thing of course is proper public transport.