The original quotation was aimed at those young people who say "I'm bored, there is nothing to do".
Whilst there are thousands and thousands of young people who are passionate about their sport, their hobbies and their lives, there are also many who have no interests and simply 'vegitate' or get involved in anti-social activities.
On here, our young members are highly motivated and that motivation is to be respected. They even ask for and accept advice from others. In fact they are developing their lives and personally I always find it a pleasure to help or advise guys like that.
This afternoon I have to go to a large local school where I'm involved in setting up a scheme which will see several students each year learn to fly a glider up to and including flying solo at no cost to themselves or their parents. It's something I'm passionate about and which will be very good for the successful youngsters. So we 'oldies' don't all just sit about and criticise the young generation.
The old adage of 'Bored? Then get a book and read' is not that silly really as there is a lot to be gained from reading, especially if it's a book with an interesting and useful theme, (like the Haynes Manual

).
Good luck to all you young folk. I truly admire your enthusiasm, vigour and ambition.