Anyone who is responsible enough should be allowed to have a pet if they want to.
I have had 3 rabbits, several goldfish, some turtles and most recently my beloved dog, who passed away 1.5 years ago. I really miss him - he was such a good dog.
My little sister has two guinea pigs as of now as well.
I've decided that I want to have a dog again later on in my life. Probably a Husky or a Welsh Corgi.