As if? I was fifteen when I started going in late '73 and I'd say about 10% were about the same. A lot of my mates were a bit older, either working in the factories or apprentices with a bit more cash than me. I think Dave Withers had just finished his apprenticeship in an engineering firm when he did the "This England" documentary.
I thought Winstanley was ancient, and Elson and Godin had beards ffs! The oldest guy I remember on the floor was called Les (I think), he was always smashed off his box and had a sort of jerky dance style, always wore a vest with a 'Twisted Wheel' badge on it. Ellis and Evison both seemed old, in fact most of the dj's did come to think of it. Growing up around Manchester, with soul in our blood so to speak, it didn't strike me as odd in any way that there were older people there. The Beachcomber was very scary because it was smaller and a lot of deals were being done, but any 'squad' would stand out a mile not because of their age but just because they were so bleeding obviously not "one of us".