We moved house to be nearer facilities. The area we were in had one bus a week, and the garden was 2 acres. Not good when you are aging.
I told my DH that i would leave him if we hadn't re-located by the time he was 70. Since DS1 is the original rolling stone, having lived variously in Cambodia, Argentina, Australia and Costa Rica and is now moving to India, via Viet Nam - the chances of him being near are remote. DS2 lives within an hour, DD lives all over the UK, moving with her job, so can't rely on being near her..
We moved to a little town not far from our old home, with doctor, dentist, small supermarket and local shops, bus and train all within 5 minutes walk.
DH mourned his garden for several years, but since he got an allotment is very happy and we have settled in well.
On piece of advice. If you are going to move, don't leave it too late - to be pushed is not a good thing... Both my DPs and ILs were resentful of having to move when they were no longer able to look after themselves alone.