When I was still in my early 60s and already retired in Thailand I seriously considered relocating to Ecuador.
I had vacationed in South America before and speak fairly good Spanish.
Unfortunately other than checking flights to Quito I didn't pursue the idea.
I cannot say I regret totally not to have gone live in South America because I have a good life here now with my newly-wed Thai wife.
But it's certain I'd now discourage any farang (US or EU) to retire in Thailand.
Costa Rica is ideal for US but I'd consider also Argentina (Bariloche) and peaceful Uruguay.