My earliest recollection was around 1967 or 68...my dad bought me some Topps baseball wax packs at a US NAVY Commissary when I lived in Japan...then when I came stateside I dabbled in the Topps 1971 BB...I got serious with the 1972-74 BB sets...I remember I thought I had the complete set in 1972 and imagine my suprise when I visited cross town to see my best friend who had moved away that summer..and he had the high numbers..
I eventually got the complete set years later.. 73 set was acquire piece by piece through wax packs, rack packs, trading with friends and finally bought one series from Larry Fristch when I couldn't find them at the nearby stores... 1974 was completely acquired card by card...upgrading at shows into the 80's..and still have them.
Stopped during high school years but got back into it again in college when I saw newspaper ad about a guy opening a card shop...and I've been collecting ever since...seriously with vintage stuff since the mid 80's...