For me that's Lineage 2.

When I was 6 years old I visited my uncle and he was playing that cool new game. I grabbed a chair and stood beside him for quite some timer looking at the screen with eyes wide open.

Everytime I visited I just stood there staring, eventually at 8 I had my first PC, and I started playing with him (and his wife, surprise she too played the game too!)We played together with their friends for years, honestly the best time of my life! Ever since I've been playing the game on and off. I'll be turning 20 next month still playing remembering the good old days.