Good Riddles

Question: When I was 2 years old, my brother was half my age. Now I am 100 years old, how old is my brother?

Question: A lawyer has a brother who is a Catholic priest. The lawyer wants to be a priest as well but cannot. Why not?

Question: I'm a measurement of time.
But you'll find me on a map, not a clock.

What am I?

Question: what is yours but you can't actually hold ?

Question: I am around everything, everything that lives because of me. What am I?