Having read the previous contributions to this thread, I would like to add my few thoughts.
The real losers in all of this are the youngsters who, through no fault of their own, are often being deprived of the chance of learning from older people who have much experience in many areas that they are willing to pass on. So why don't the "oldies" do it?
From my own experience, the hoops that have to be jumped through in order that you may be classed as being "safe" to work with young people will deter many otherwise willing people.
Having been given a police clearance when the scheme started (mid 70's, I think), I was allowed to work in Further Education with students ranging from 16 to 60+. Yes, there is a great deal of satisfaction to be gained from seeing the progress of any student, but even more from seeing a youngster becoming skilled in certain areas.
As we spent a lot of time in workshop conditions there was always a problem with the "we know it all" of the youngsters, in truth they didn't know enough to know how little they knew! How some of them managed to even cross a road safely baffles me. But what do I know? Having been told several times that I was just "an old man" who was passed working for a living, I agree that some of these little people need (and received - big time) a lesson in manners. They could never understand how, for the first time in their lives, someone would take them to task for their very poor behaviour. Obviously it had never happened at home or school.
Having left full time work, I was invited to take part in a scheme to introduce school children into engineering in a local school. Great idea, worked well, very enjoyable for all concerned. Then the p.c. stuff started. Forms were sent out to register for clearance (again?). I took one look at them and binned them. Do I need all of that hassle after over 30 years of doing the job? The losers? In my opinion, everyone.
There are some great youngsters out there who, given a bit of encouragement, would take up all these various interests. Sadly, the system imposed to protect them may just be the very means of depriving them of the chance to do so.
Regards,