My hubby and I are 71 and 72 ans live in a very small hamlet with no shops, regular bus service or Church. Hubby struggles with mobility, but still drives, and I am partially sighted and struggle with getting about on my own.
However, we have Call Connect - a bus service that is "on request". As a pensioner, journeys are free of charge (you need a bus pass from the local county). When hubby could not drive following an operation, I used the bus service to get into our nearest town, which is four miles away, to do shopping and to collect prescriptions (though the surgery will deliver if required). I used a taxi to come home, simply to save waiting - there are no seats and few bus stops, even in the town (though there is a bus station where seating is available), The bus station is a goodly way from the supermarket I use, though there is a closer alternative. There is currently a small hospital in the town, and many other useful businesses, cinema and theatre. I did use a grocery delivery service for a while, but experienced problems with missing items (one time £12's worth!).
In short, as others have said, you need to check out the areas you'd like to move to - and make sure it has the facilities you need.