Maybe 1973 - On a trip to Reno with my parents, thought the casinos looked cool, ate at the Mapes. In 1974 got a corporate 1973 annual report from Harrah's, decided it was an interesting business. In March 1975 took a trip to Lake Tahoe with parents (just 14 at the time) and discovered playing cards and dice with casino logo's, been downhill ever since : )
My first chip was a $1 chip from the Sahara Tahoe that I asked my dad to get for me.