No, but he could be at about 24 yrs old.
I was using rank because that in the RAF use to be used to define responsibility, I cannot remember the figures, but an SAC could carry out something like 50% of task unsupervised, a JT 75% and a Corporal about 100% hence in theory equivalent to a licenced engineer, minus the legislation part, which as pointed out is about senior engineering officer equivalent or OC Eng Wing......... But that was when the highest rank on a Station used to be the Groupie Staish.