From the best of my recollection, I got into it when Dad bought Jesus Christ Superstar on reel-to-reel, circa 1970. I remember clearly, I really got into it. He was also into Burt Bacharach, and Herb Alpert (superb) and listening to this music solidified my interest into HiFi gear itself. Subsequently, in an effort to create a better experience, I began reading everything I could on the subject, pouring through material and catalogs day and night.
My Dad had all the electronics stuff laying around, so soldering, Simpson meters, etc were commonplace. I just would dig into all sorts of stuff.
By early high school, I was the dude everyone came to to de-mystify audio myths, purchasing decisions, and began repairing of gear and making DIY loudspeakers. Dad and I traveled across the country, filming and making high quality stereo recordings of trains,...primarily steam locomotives on special excursions. This got me into direct to two track recording, which is something I ended up pursuing my entire life.
I had, by a wide margin, the greatest car stereo in a large high school,... in a 1973 Plymouth Fury III sedan (land yacht). For my next vehicle, I had a '76 Chevette, Alpine head end (back when that meant something) with an actively crossed over, four way system with a 10" dual-coil high excursion Speaker-Lab sub, all Alpine drivers all the way up to ribbon tweeters. I had both Linear Power amplifiers (US made!), and Alpine Even today, it would be outstanding. Back then, at that particular time, it was extraordinary.
Eventually, I got into sound reinforcment, and FOH engineering.