by learning to speak french
Unless you are French, you can only join the French Foreign Legion.
No, speaking French is not a requirement to join the French Foreign Legion. However, recruits will be expected to learn French during their time in the Legion.
no they can not
As far as I know, you have to be in perfect health to join the French foreign legion. There is a thorough medical check during the selection process.
If they weren't a French citizen, their only option would be the Foreign Legion.
You cannot enlist with the French Foreign Legion from abroad. You have to travel to France, and to go through a selection process and selection tests. Terms and conditions are explained in link below (French Foreign Legion website - English version)
Gurkhas were amongst the toughest fighting men alive. Check with the Legion.
40
If you're a French citizen, you can join the French Army. If you are not a French citizen, you can join the Foreign Legion, but you will be enlisted as a single soldier regardless of your marital status.
yes
Not until military time in your unit is over
Around 1500 to date