If bmx bikes are not for adults then I was 33 when I got my first adult bike. 2008 Giant sedona cx. I still have it but just upgraded to Jamis Durango A1.
I believe it was a Camel 10 speed road bike circa 1969. You have to be kidding with your comment on most of us starting out on BMX. I was already riding about 20 years when they came out. My first modern mountain bike was a Giant Iguana which I still think was the best name ever for any bike. That was somewhere around 1990. I say modern because we were riding our Schwinns on technical trail backs in the 1950's that still challenge my current SC Tallboy.I think its safe to say most all of us started out on BMX style bikes, but what was your first adult bike? My path to a mountain bike was a hand-me-down RB-Montgomery Wards 10 speed in a sand yellow, dating myself a bit, but mountain bikes were not a thing yet., next a RB-Nasiki custom sport 10 speed, RB-KHS Fiero 9 speed, then my first MB, a GT Tequesta hard tail, loved this bike for climbing with. (Put many miles on this one), RB-Viscount Aerospace, RB-Greg Lemond, Buenos Aries 9 speed, back to MBs, Specialized M4 Stumpjumper (blew out the rear shock mount on this one, it was a poor design) MB-Jamis Drakar, a flip bike, I rebuild it and sold it. My current MB, a Specialized Stumpjumper 120. RB-Specialized Allez, Other bikes hanging on the wall but don't ride much, MB-Trek Y5, MB-Norco Nitro hardtail, and a Archetype Bloodline 24" BMX. My next endeavor will be a Gravelbike. I've looked at many but the top three are a Salsa Cutthroat, Trek Checkpoint, & Specialized Diverge, leaning toward the Trek.
I'm a bit old for BMX but still have this bike. I chuckle when some make their claims for first riding a very popular trail complex because in the late 60s one neighborhood mom would shove bikes in the Ford station wagon and drop off boys with metal lunch boxes at the same trailhead. Even in late 1960s not all the parents were cool with that.A Schwinn Typhoon so I could deliver news papers in the late 60s. Wish I had a dollar for every flat that I had using it to explore the local hiking and horse trails.
Then a Centurion Le Mans to get back and forth to school. I had 700x32s on it and rode it everywhere. Rim brakes were a big improvement over the coaster on the Typhoon.
First MTB was a '87 Univega Alpina Uno. Raced that bike for a couple years. Also used it for bike packing with my friends.
Found dirt bikes in the early 70s and never had a BMX. My friends kids had some, but at 6'2" they were too small and awkward for me.
Adult BMXglobalcountry...I think its safe to say most all of us started out on BMX style bikes, but what was your first adult bike? My path to a mountain bike was a hand-me-down RB-Montgomery Wards 10 speed in a sand yellow, dating myself a bit, but mountain bikes were not a thing yet., next a RB-Nasiki custom sport 10 speed, RB-KHS Fiero 9 speed, then my first MB, a GT Tequesta hard tail, loved this bike for climbing with. (Put many miles on this one), RB-Viscount Aerospace, RB-Greg Lemond, Buenos Aries 9 speed, back to MBs, Specialized M4 Stumpjumper (blew out the rear shock mount on this one, it was a poor design) MB-Jamis Drakar, a flip bike, I rebuild it and sold it. My current MB, a Specialized Stumpjumper 120. RB-Specialized Allez, Other bikes hanging on the wall but don't ride much, MB-Trek Y5, MB-Norco Nitro hardtail, and a Archetype Bloodline 24" BMX. My next endeavor will be a Gravelbike. I've looked at many but the top three are a Salsa Cutthroat, Trek Checkpoint, & Specialized Diverge, leaning toward the Trek.