I retired to the coast in Somerset and am so very glad I did.
Our town is like a playground for older people who enjoy hill walking, cycling, U3A, volunteering, sea swimming groups, sports clubs, local history, church, coffee mornings, craft workshops and plenty more, so lots of opportunity for making friends.
You sound to me as though a town would suit you better than a village or rural isolation. Plenty of shops and cafes, pubs and a cinema to enjoy. Choose a town where people actually live - not one that is a second home place where things can be very lonely.
Be aware that you might not have the resources you're used to, public transport is dire. Getting a doctor, vet all the essentials here was fine, probably better access than the city I lived in before. Dentists are a problem here, but I believe they a problem everywhere at the moment.
The thing you have to ask yourself is why you want to live there. If it's because you like it when the sun shines and you're on holiday, think what you will do all year round. Do you have a reason to be there? You need a reason otherwise you'll be adrift. You have to be the kind of person who enjoys the empty, quiet, winter months. I love the bustle when the tourists are here but even more so I adore the bleak, quiet, empty peace of what actually is the majority of the year. It's only really busy here for a few short months and the rest of the time it's bliss. I enjoy watching the tourists in the summer and every single time count my blessings that when they all go home I can stay as I actually live here and we have it to ourselves. Those huge empty hills and beaches in October or March are fabulous with a dog.
You have to throw yourself into things and make it work, otherwise you will always feel as though your 'real' life is where you lived before and where your family are.
The time almost certainly come when one of you will be left on your own, but you hopefully have many, many years of enjoying life on the coast. I love it and have no regrets.