Yes, because it is a proper name of a group of people
You don't capitalize it except if it is the beginning of a sentence
No.
You spelled it correctly.
Ridgewood Bushwick Senior Citizens Council's population is 2,009.
The population of Ridgewood Bushwick Senior Citizens Council is 553.
Ridgewood Bushwick Senior Citizens Council was created in 1973.
No. Class should not be capitalized.
a senior class is the final class in high school and also the class for 17 year olds and older
It depends on how it is being used, but in most times no, it will not be capitalized. If you're using the word to distinguish between a father and son of the same name, then you capitalise it, For example: John Smith Senior John Smith Junior
When you are writing formally you should, but you dont have to.
yes
Yes, you should capitalize "French" when referring to a French language class as it is a proper noun.