Arrived here when I was 19 and I'm 62 now. Been some ups and downs in my life here, but very happy where I am now. Moved upcountry from Bangkok just over 2 years ago and at the end of this month I will have been retired for 1 year. Speak the lingo so am not dependent on anyone, and also understand the local dialect to a good degree so can have a good natter. The visa stuff is behind me now, which is great. Perhaps the only downside is trying to find a couple more things to do, besides cycling and fishing, to keep me occupied now I'm retired.
After all the time I have spent here, I don't think I could live in the UK again. I've only been back 5 times in the past forty odd years so am really out of touch with life there. Thailand is my home, and I will pop my clogs here (hopefully not too soon).