Why won't they, they've got a far younger squad than we have, are far fitter and are working as a unit, much more consistently than we can manage. I'd say they've overtaken us by a distance this season.
That's a bit of a statistical anomaly because the majority of their squad (14) is 27-30 and in their peak years. They've only got 5 players who are 26 and under; Robertson, Kiera, Origi, Gomez and Trent.
We have (15) who are 26 and under;
Ederson, Laporte, Stones, Garcia, Mendy, Zinchenko, Angelino, Adaradiayo?, Cancelo, Rodri, Foden, Sterling, Sane, Bernardo, Jesus. We only have (4) Walker, Gundogan, De Bruyne and Mahrez in their peak years of 27-30.
The overall age statistic is skewed by Bravo, Carson, Otamendi, Fernandinho, Silva and Aguero - none of whom will be here by the end of next season. Liverpool only have Milner and Adrian over 30.