Good point about age and the inability to learn Thai.
Jim Thompson, Bernie Trink, and many other well-known people tried and failed after coming here "too late" in life.
Living in a country and not speaking or understanding the language is a cognitive impairment akin to being deaf and dumb.
Some say it's not important as long as you stay in the tourist ghettos. I'd say it is more important there than anywhere else.
In those sleazy locations it is always open-season on foreigners in general and farangs in particular.
Away from the rip-offs and scams of holiday destinations it is always a good idea to know what is going on around you as well.
Some people seem to be born with an aptitude for learning languages - at least when they are younger.
I wasn't, but I overcame it to learn Thai because I didn't want my wife and our children to see me as an illiterate who couldn't speak the language.