If the "Mick Farmery" [Member 127] is Mike Farmery of Thames Hare & Hounds (who certainly did some fell running), then a bit of research on runbritainrankings shows that he turned V65 in 2017; which would suggest an age of 27 in 1979.

Plenty of other well-known names among those early members in your list, but I don't feel inclined to do any more searching the www myself. [I did have a look for Joe Sherriff [Member 51], whom I knew, but didn't come up with anything.]