there are language schools all over the world that teach the local language to incoming foreigners of all ages.

these schools will be listed in phone book of exact city you are interested in, or the person can get in touch with an association in france that has a master list of schools and programs. the education department of U.S. consulate in frnace can at least inform teh interested party of which programs have registerd representatives in that french city.

a google search will bring up a lot of interesting possibilities.