CRB checks are no problem
My personal view:
I love teaching teenagers (technically children) and get far more satisfaction than taking a middle age (50+) man or woman. Teenagers are receptive to formal instruction, learn quickly and have good reactions; I can quickly see the results of my instruction.
I took a twelve year old girl in a C152 yesterday for a trial flight. The parents had never met me before and were trusting their daughter to my care, in an isolated environment for the best part of an hour.
I think that a CRB check is not too much to ask of us. The £58 charge does not really break the bank.