childish thing also, and would look at any adult sports fan and say "Grow up" or possibly "You're just living in the past". And they would be wrong. Sports for most is at least, an interest, and at most, a huge passion. Nothing wrong with that, it's where there interests lie. Nothing childish about it.

Likewise, there are many adults who just love to go and spend time at Disneyland, DisneyWorld, and the other themed parks. It's something they enjoy, and there's nothing childish about it. For them, it's an interest just as much as sports fans have interests in sports. It may seem childish to you, but that's because you've attached your own feelings/opinions to the issue--ones very different from those that love to go.