I ended up in Greece in 1993. Went for a week and stayed 7 years. I would probably still be there if I hadn't met my (now) wife, when I went on a trip to Scotland to scatter my Mother's ashes.
I don't know what it is you want to hear Fieldgate. I felt very at home there and still do when I visit. But I also met many other ex-pats who didn't stick. The problem is there is no way to know whether a place will suit you or not until you have lived there for a couple of years. That's why I always tell people to rent for at least 1 and preferably 2 years first.
When I arrived in Greece, I was 46 not 65 and that is another factor I think has to be taken into consideration. What will happen when you are 80 for example. That's when any short-coming in health care, language barriers and just friends and family to support you may become major factors. For me in my 40s and early 50s it wasn't an issue. But if I'm honest about it, I can't imagine how someone who is much older and gets ill would cope.
I coped fairly easily. I did see a lot of people who couldn't. In fact I believe the number one reason people don't stick is simply because of the differences from home. It isn't good or bad, it's just different. I had to learn to just let things go. I saw a lot of people who drove themselves crazy fretting over Greek bureaucracy for example. Accepting different seems to be easy for some and impossible for others.
I never became fluent in Greek. I can get by and understand what is being said most of the time but certainly can't really write in Greek. It wasn't a major problem as most people speak English simply because of tourism. However language can be a major issue if you have some kind of medical or legal problem to deal with.
After I had been there a year I thought I was integrating fairly well and being accepted by the locals. It was only after about 3 years that I realized I was wrong and only after 3 years was I really being accepted. It's easy to mistake friendliness for acceptance. The first comes fairly easy but the second takes much longer to really happen. In my case what I found was that the locals were used to people coming to live and then leaving after a couple of years again so they were friendly but held back to see if you are really going to stick or not. Being invited for dinner with a family is different from sharing a drink with a guy in a taverna in the afternoon.
But the answer is yes, I was accepted and became part of the community. Even now after not having lived there for 10 years I am welcomed home like family. I was there this May, just showed up without warning. Within hours, people started showing up to welcome me back. I had 3 offers of places to stay, a car to use and invitations to dinner. During my 2 weeks there (as on my last few visits) I had more free drinks and meals than I paid for. Greeks are wonderful people. They are always friendly but keep a space at the same time. When one decides however that you are a friend, you are a brother. I was fortunate to find that kind of friendship with several people on the island when I lived there.
One other thing I will say in regards to your posting this. Don't listen to anything anyone who has spent less than 5 years in a country says. Thye are still in the honeymoon phase and justifying their choice. You may be surprised how few responses you get from those who have spent more than 5 years somewhere. By my reckoning, for every 10 I saw come to the island to live, 5 were gone within 2 years and 9 within 5 years. It's that 1 in 10 you really want to hear from.