Strictly anecdatally (nb: intentional), I moved to France at 26, spent a total of five years living in France before heading back to the US, have kept French involved in my life, and now fifteen years later will have French people ask me where in France I am from. Which is to say, that this article reads as personal experience more than anything else. However, French is probably a very unique case for study. French p…
I also learned French as an adult, first in school and then by immersion. I also learned Mandarin, although not as well. I’m somewhat functional in it but not at all fluent. French is really easy by comparison, coming from English. You get a shitload of vocabulary for free. It uses the same alphabet with minor differences in sounds. Grammar is different but with many familiar concepts.
English is basically French mixed with Germanic languages and then baked for a thousand years. English gives you a great foundation for French.