Interested in...... I am interested in flying. I am into flying. I was interested in flying. I used to be into flying.

See if you can feel the meaning from my (true) story: My cousin is over 40 and he's still really into Star Wars. He first got into Star Wars when he was a boy and he has been into it ever since. He knows a lot of the words of the films by heart and still has figurines and posters in his house. To be honest, some people might think that it is worrying for a grown man to be so into Star Wars.