Until relatively recently (certainly mid '60s) you could join the RAF as a Boy Entrant at minimum age 14 and a half.
You were attested as a full member of the RAF and, with 18 months training as a BE, could be out in the "real" RAF by age 16.
Not quite correct. The youngest you could join as a BE was 15 1/2 years. I think the 14 1/2 was the age at which you could apply.
Aaron.