My husband is a lawyer and he is advocate for elderly people.
What kind of cases does he handle?
He mainly deals with discrimination in the elderly.
Oh, so cases of workplace discrimination?  Are there industries where this is common?
Basically just when they ignore a person's idea because they are older.
It seems like it would be very difficult to prove such a thing!
It can be difficult sometimes but he seems to enjoys it.
Has he ever worked on any class action suits?  For example for age discrimination across an entire organization?
He doesn't practice law where it is a group of people, he just helps individuals. 
How does he find his cases, then?  Do his clients contact him?