The RAWKites are worrying and no mistake. There are 11 players in a football club's first team.
Let's say the cut off age is 23 (so we explicitly exclude Trent, and also Kelleher).
In terms of elite youth, the pinnacle right now is what? Foden? Who else? Pedri? Let me know.
We only have Jones (20 - puts in numbers to rival Thiago in terms of ball retention and final third penetration), Elliot (18 - was putting in pressing numbers up there with Keita early this season, is demonstrably a better player already than many already in our squad - take Minamino, for example), Gordon (17 - tell me he doesn't look a phenomenal talent), and let's include Konate too (22, everyone's happy if he starts against any side in world football).
That's a conservative list that excludes the less obvious ones with question marks like Williams and Williams, like Beck, like Morton, like Bradley... but in terms of that starting 11, we're already on the brink of being able to blood 4 players with an average age of na-na-nineteen.
The worry isn't about youth stepping up. The worry is that, if you picked a first choice team tomorrow it would probably look like this
Alisson (29)
TAA (23) Matip (30) VVD (30) Robertson (27)
Henderson (31) Fabinho (28) Thiago (30)
Salah (29) Firmino (31) Mane (29)
Now, you could argue the toss on Firmino/Jota, but if there was a CL final to be played tomorrow and everyone was fit, that team wouldn't surprise anyone. 7 of that team will be 30+ next year. What is missing from the squad is 4-5 24-27 year olds pushing to break into the first team. Of the teenagers you mention, how many could you expect to play 30+ times next season? And while other clubs may not have as many players coming through, that is because they have shown a propensity to spend on the mid-core of the squad. Basically, while it may seem exciting to have 4 teenagers coming through, it comes at the cost of that middle cohort, which is why Liverpool can appear a bit stretched at times.
If you look at the average age of Spurs (a team that, if they win their games in hand will be 3 points behind Liverpool) the average of their squad is nearly 2 years less. In other words, they have 2 seasons/4 transfer windows of an advantage on Liverpool in terms of rebuilding/refreshing their team. Mancherter City, United and Chelsea have a 1 year advantage. That's not a happy place to be for a team that emphasises player turnover, sell to buy, budget balancing and views contracts for 30+ year old players somewhat dimly.
It actually reminds me of Everton under Moyes, where the first team got old together and the players behind got left behind. It's also what happened at Dortmund under Klopp, where his fab first team got old together and he was unable to replace players as the funds weren't there.
Liverpool's squad needs investment in the middle and upfront where age (and age associated injuries) is creating an unsatisfactoy concentration in terms of the age profile of the squad. Waiting for the youth to step up will be too late and too demanding on the youth.