Yes one you may know is Andy Warhol.
Mugalula mukibi
yes
Banksy
NO
Yes. One of the best known German artists is Albrecht Dürer, for example.
Yes there are. Some famous graffiti artists are Lee Quinones, Jean-Michel Basquiat, Cope2, Phetus, Indie184, Such, Banksy, and Kaws are some of the most well-known artists.
Lee tiller, Jacqui Blackman
Edvard Munch, the Scream
Sure, there are a few. Check out Mucha for instance
Clarice Beckett Grace Cossington SmithGrace (?) Sutherland
Yes, Jonas Gutierrez, raul merreles, rodrigo martiniez
You can be any age to become an artists as long as you believe in yourself and truly love what you are doing.