Feed that current passion (trains). I had trouble with fighter jets because all the specs and artillery didn't interest me. Luckily DH had some interest/knowledge. I saw an amazing train museum out near Amish country in Pennsylvania. It was so cool. I've taken the old-fashioned, coal train from Durango, CO to Silverton (really neat). People come to the middle of absolutely nowhere NM (90 miles from here--practically nowhere) to watch trains, because evidently it's cross roads for ATSF & several others. I met an older gentleman once who was describing his upcoming vacation--taking a train cross-county, then back (no anticipated de-training, just the ride--isn't that strange?). Passions are funny, and safe to say, some come and go. DS13 who knew every single thing about dinosaurs at 2 doesn't remember any of it.