Reading the original OP, I would have thought that their Adult children and GC felt that it was not their business to make any comment. Onviously have enough respect for the OP's intelligence to make such decisions about their lives for themselves.
If input of any sort is required from these relatives, then perhaps the OP could contact them all again, asking how they feel about it.
I was 79 years of age when I made the move from a London suburb house 150 miles away to a flat in the West country. Yes, in a town that one of my AC lived.
Having only previously lived in a flat before I married - a council flat - I had always been very opposed to these and concerned about the on-going costs of service/maintenance charge.
I am very fortunate in that the flat I moved to had a large living./dining room, and an en-suite shower room as well as a separate bathroom. Two bedrooms. I am on the first floor - so try to use the stairs rather than the lift when possible. A nice patio balcony.
I love it - did so from Day one of moving in. Wonderful to be able to fall out of bed, across hallway into (no stairs to negotiate). Sometimes, if having a bad night, out of bed and next door into Living room.
Garage on ground floor where I keep and recharge my mobility scooter, etc. as well as being a useful store area. Our letter boxes are all at the main entrance, reached to put things into, from the outside, we open them from inside. Lovely entrance foyer, where usually see other people living here and can have a short chat.
I worked out that the amount of money I usually spent most years on maintainance on the house was [retty much equal to what I now pay in service charge and I have none of the responsibility and worry.
Yes, Lifts are a major problem. with the best will in the world - no-one can guarantee that any lift will be working all the time and any breakdown will be dealt with in four hours. Sometimes parts have to be accessed from other countries causing delays, etc. If only one lift serves the flats, then do be prepared for times when it may not be working.
Apart from that I really cannot think of a single downside to living in a nice apartment/flat. I think I get less noise from neighbours here than I did in my 1930's house. Wonderful feeling of security here - can leave windows open in the summer when I am popping out for a couple of hours.
Energy bills lower as (I suppose) we all help to heat each others flat, neighbours are around if I want a chat, but not intrusive. We do have some community get-togethers and happily take in each others parcels, etc. I never enjoyed gardening, indeed had to employ someone to do this inthe last couple of years at the house. My patio balcony has room for some pots of both real and faux plants and garden chairs and table.
Having made up my mind about this, I informed my AC, not asked them. One did object and came up with all sorts of worries, but they were more to do with me moving so far from London where I had always lived than anything else. And, she has now admitted she was wrong and my living in a small town is actually easier for me to get to things.
Do ensure you really know the area you are thinking of moving to. Different times of the year as well as nightime as well as daytime.
Have a good look at all the many different apartments available and select the one(s) you are interested in. Make a good list of the really important things for yourself. For me, I wanted a garage, and either a four-piece bathroom or (preferably) a shower room and a bathroom. A large Living room was an absolute and a spare bedroom. Wanted to be in close proximity to bus service. I did not wish to live too high up - first or second floor - even if that meant giving up wonderful views.
Take your time - it is probably going to be the last move of your life, It is important to get right. ANd, do look beyond the decoration, etc when you are viewing. Think how you can put your own stamp on it once you have moved in. Check what rules the Maintenance company have regarding to alterations to each flat, and any other rules and regulations regarding parking, etc. that may effect you.