I think is normal to stop doing things because they are not as amusing as before. Maybe it is because the age, the time and the activities related to it, maybe as you get older you learn new ways to have fun. As a young man I used to collect a magazine brand and some comic cards. They made me happy for some time but as I grew up that magazine or that cards became useless items I did not need. One day, I stopped to collecting everything and get more comfortable taking some drinks with my friends or going to the cinema. Collecting thing is something I do anymore.