Perfect timing for this new challenge! I've bought at the first two days of this season a few young players and the average age of my main 11 players is now at 19.5 years.
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My new striker had some real nice games so far (his form: 9-9-8-8-8; 9 goals and two assists in 7 games). I bought him for 14 tokens (as far as I remember he had 93%) in the TM and trained him the AMC position and the freekick SA. Hopefully he will be worth it.
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On the bench I have three more 18 year old players (strength between 91% and 93%). The striker (Martac) performed bad in the first benchmark training (= slow trainer) but I will leave him for now and sell him at the end of the season. I dropped my team quality at the end of the last season so I do have quite a lot weak teams in my league. Maybe I will throw the three youngsters on the bench out in more games to have a chance to get more points for this challenge.