About 1991, prob about a year after getting first mtb (Trek 950) but shortly after witnessing friend get knocked out, still doubt they'd do that much in an accident and wear one mainly so no lawyer could discount any payment for "contributary negligence" should the worst happen on the road, off-road they prevent my naked bonce getting scorched or ****ted by twigs.
Sometime in the early- to mid-90s, aged 15 or 16 or so.
Somehow I survived the Cycling Head Injury epidemic of the pre-helmet days.
When I was 30 and hiring helicopters to fly me up mountains in New Zealand. Those were pretty rad days.
Early 80's. My mum (Santa) bought me a Nolan motorbike helmet when i got my Super Burner. . Wore it xmas morning for a couple of minutes and swapped it a year or so later for a copy of Michael Jackson's Thriller video. Had to wear a lid BMX racing /comps/ demos but never when riding for myself. Thousands of crashes and not one head injury in 20+ years of licking the BMX envelope. Probably just luck
Just found a pic that pretty much looks like my first (save for the brand):

I am so glad they invest in design like they do now!
When I got my first proper bike - a special edition chrome Raleigh BMX. Was back in the days of BMX Bandits
It was a red plastic shell with chin strap and a white peak that attached with poppers that popped every time I went OTB riding home made jumps (ply wood and bricks) in the close we lived in. Happy fearless days.
I've got a new found respect for head injuries this week after a silly head injury in the house has left me struggling due to the effects of concussion on the front area of my brain.
The first head gear I can remember buying, was one of those three band, stop you loosing your scalp, jobs from Sandy Wallace Cycles in Inverkeithing. Similar to this, but in Italian colours.

My first proper helmet was a large, poorly ventilated Spesh one, bought in Aberdeen in the mid Nineties, on the advice of various Triathlon racing colleagues.

When was this a thing?
I bought exactly the same helmet and covered it in stickers from the cover of MBUK
