This thread seem a bit vague and pointless, unless we've signed a new player called "Some Youth". There seems to be a lot of theoretical arguaments about the benefits of playing "some youth", along with posturing that young players from other clubs wouldn't get any game time for us, but to me it all seems a bit irrelevant without talking about the specific players instead of this vague "play someone young" thing.
When you get to the specifics, there really aren't a whole lot of even decent candidates for game time, yet alone any obvious candidates. Our best candidates are all out on loan, leaving mainly very young, not yet physically developed players, most of whom aren't anywhere near ready. For me, there aren't a whole lot of obvious options. Barker would probably be the closest, but he's not been at his best in the second half of the season, so do you really want to throw in a player when they aren't at their best? Maybe he's tired after a long hard season, I don't know, but he hasn't looked as dominant as he was earlier in the year.
Angelino and Maffeo look like real prospects, but Angelino is still a work in progress defensively, while Maffeo has never even played RB above U18 level as he's been playing CB for the EDS (where he obviously can't play for the first team, given that he's a midget). I wouldn't really want to throw a young defender into our already shaky defence anyway, it doesn't strike me as a particular helpful environment at the moment.
Ambrose could have been useful, but has been struggling to get fit for any stretch of time since injuring himself and I believe he's now out for the season? Pozo has now pretty much had his confidence destroyed by his first team outings, so I'm not really sure he should be anywhere near the squad at the moment untill he can regain his confidence (which is also a good example of the potential harm of throwing players in before they are ready, although playing him out of position didn't help)
Midfield wise, it's hard to say any of them look ready for consideration.
That's just my opinion though, I'm sure people who watch them more might have more insight into the individuals who could be ready to gain something useful from a chance in the first team.