Mystery Trivia Tuesday: Mycroft Holmes

Mycroft Holmes, Sherlock's older brother, makes an appearance in "The Greek Interpreter" and "The Adventure of the Bruce-Partington Plans." How well do you know the man whom Holmes trusted more than anyone.
1.  How much older was Mycroft than his younger brother?
2.  What was the name of Mycroft's club?
3.  In which part of London did Mycroft live?
4.  What color were his eyes?
5.  How much money did he earn each year?