Questions:
Why do people collect things?
What do you collect or what would you like to collect?
What other hobbies are popular with teenagers in your country?
My answers:
I think people gather things since they are connected with nice memories and feelings.
Some things might be unique so no marvel that we tend to pay attention to them.
As for me,I collect old denominations for 10 roubles because I want to sell them at high price in remote futurity.
In Russia young people like to do bodybuilding.
Many teens go in for reading.
Such hobbies become more popular.