I read in the news, Brexit transfer rules ensuring in future, the club could no longer sign players under the age of 18 from Europe.
Might need to depend on our academy to replace some of our (going to be) "older" players, I guess.

Can't imagine that would stop players from England, Ireland, Wales and Scotland though, so not just necessarily Liverpool lads.
As for the age profile of the team, well I had mentioned it last year too but you need 3 tiers in the team
Tier 1 - Young players with potential to be class players (Harvey, Carvalho, Curtis)
Tier 2 - Players at their physical peak (Trent, Gomez, Ibou, Kostas, Robbo, Naby, Arthur, Diaz, Diogo, Darwin)
Tier 3 - Players who are top notch despite being past their physical peak, but bring non-physical attributes e.g., experience, leadership etc. (Adrian, Matip, VVD, Milner, Fab, Thiago, Hendo, Ox, Firmino, Salah,
We unfortunately have too many in Tier 3, and some in Tier 1 but not enough in Tier 2. We'd be better having most of our players in Tier 2, with a few in Tier 1 and just a handful or so in Tier 3. If you look at who we have in Tier 2, they are all players who are struggling with injuries, or have just arrived into the team, or having a pretty bad run of form. In other words, we have too small a group of players that should be carrying the bulk of the intensity of our play, and all of them are struggling to perform at their best, let alone get on the pitch at the moment. This has meant the extra burden has fallen into the Tier 3 players who, in such a congested season without adequate preparation are definitely showing signs of lack of condition and form, and also the Tier 1 players who, despite their great potential, are being asked to do too much for their current level of ability. As much as I rate Harvey and Carvalho, and Curtis... on their current level of ability, they shouldn't be playing week in week out if we want to challenge for the title, and win the CL.
Unfortunately, the solution is to rebalance the squad. We need to desperately replenish the ranks of players in Tier 2, but with really top class players which is much easier said than done. I think we could be in for an extended rebuild which might take a few seasons.