I've worked on many different projects for 'young people' and the age range can be anything from 11 up to 25, occasionally even 30.
I would ask yourself why this specific question is what you are choosing to focus on.
Whether the younger people in this situation are 17, 18, 20 or 23, there is no question about where the weight of power, money, age and influence lies here.
And there is no question that the behaviour of the (much) older person, as described and verified by the BBC, is appalling.
Why would you want to minimise or distract from that?