South East Asia has been against long term tourists for many years now. They want all the "families" and richer tourists who stay for a few days in expensive hotels that hire lots of local workers.
My dad retired to Thailand 20 years ago and until he got too sick to take care of himself had no problems with any of it. (And after he got sick and before he passed, the home we managed to get him placed in helped him get a 'humanitarian exemption' to being deported for visa crimes).
They aren't going to kick out elderly tourists who have been there for years, but it is a new move to encourage wealthier tourists that contribute more to jobs and the wider economy. South East Asia also know that they can't maintain the low cost lifestyle on one hand and help their people become richer on the other hand.