I came to London for 6 months in 1970- so had to learn all the Imperial system and old money. Then went back home, only to be wooed back to UK- and straight into the metrification saga and new money, lol. Had to do driving license again, on 'wrong' side of the road. As said, it is good for ze little grey cells.
As a mother I had to adjust fast to help my daughters, first learn English correctly, then nursery rhymes, games, traditions, all great fun.
Don't we owe it to our children and grand-children to find out and learn new methods so we can best support them. What example is it to just throw our arms in the air- if we want them to fight difficulties and succeed. It shouldn't really take half a lifetime to make minor adjustments? Should it, really?
Sorry - I know this message won't be popular- but here we go, LOL