JJ,
That is exactly my thinking! My little sister wants children someday (she's 17), and I'm totally excited to be the cool aunt.
My boyfriend always intended to have kids but after hearing my opinion has said that being the cool uncle would be great too. I hope that once we get older and it seems like all his friends have kids, he'll be thinking the same way. His uncle, who was childfree, was the male relative he most admired and wanted to be like in his life.