You usually get pubic hair around 12 years old
Yes I have penis hair but I dont have underarm hair, but I do know friends that do have both or just one of the other.
It is normal for hair to grow on the shaft of the penis to some extent. If it is bothersome or interferes with condom use, carefully trim it or shave it.
Yes. It turns me OFF.
You grow pubic hair because when humans lived long ago they didn't have clothes, so they adapted and grew hair to protect them selfs.