Shirts

Some time ago, my kids were shocked to find that, in my vast t-shirt collection, there wasn't a single Star Wars themed one in the bunch. I recently remedied this by buying 3, count 'em 3, Star Wars shirts. When they arrived in the mail, my 8-year-old was quite impressed/jealous with my selections and said, "Dad, can I have those shirts when—" and here's where I thought he was going to say "when you die," but instead he said, "... when you grow out of them?" So does that mean he thinks at some point I'm gonna get fat and they're not going to fit any more?