This guy has been a hero of mine for years. Looks like his stuff is at least 20 years old, but every couple of years he surprises us by uploading more. This one will have two more parts to come and I think the new girl on the left (Tani) will be an amazing sight
Those who like hair, mess and smushing, do yourself a favour and subscribe to this guy. Norman Mabeld, I'm sure you'll like this!
This old stuff is really great if you like a focus on hair getting messy - and pretty extreme in some respects (not so keen on his more recent work which has appeared here in the last 10 years).
I guessed 25 years or so, too, originally but some of his descriptions and comments suggest they may be more like 35 or 40 (late '70s). Prolonged 'shampoos' with cake ingredients for several hours in some cases with two or three women at a time taking it in turns. They're perhaps college friends and certainly don't appear to be professional but he persuaded them to do it somehow! Cleaning up for them must have been quite involved.