My father introduced me to scale modelling when i was about 5 or 6, and having 2 model stores in my local area certainly helped keep me interested
Military exhibitions & museums were visited fairly regularly too
Movies & tv have played a big part too. Around the late \'80s there were a lot of Vietnam war movies & series (who remembers Tour of Duty?) and i started buying jeeps, choppers & figs from that era.
on the fantasy side definately Tolkien. Read the books when i was a kid & played a few games of MERP with schoolfriends, but i was never really interested in minis back then. The Peter Jackson movies sparked my interest again however
...and did i mention the internet?