Started in 1961 at age 12 when my oldest brother gave me his copy of Avalon Hill's _Tactics II_ on going into the service, first playtested for Jim Dunnigan in 1966 (Avalon Hill's _Jutland_) and have credits in board wargames, RPG's, computer games and science-fiction novels. Even snuck a scene into a movie - the fire extinguisher finale to the otherwise awful _The Net_ starring Sandra Bullock.
All as a hobby just to have fun, and share it.
Impressive.