I think this is a little premature and a touch naïve.
They have some experienced players heading towards the latter part of their careers, but they still have a lot to offer at this level.
As mentioned, Alexander-Arnold and Robertson are top class in their respective positions and if remaining injury free, have years of playing time left. Tsimikas, he looks as good, if not better than Robertson.
Alisson, along with Ederson are the two best keepers in the world and that Kelleher could play for most Premier League teams.
van Dijk is solid at the back. Matip always gives me the impression of Bambi On Ice......but is deceptively effective. Their new signing from Germany is only young, but looks a real prospect for the future.
Salah, Mane and Jota, supported by Firmino sometimes run a bit hot or cold, but when hot they can be goal machines.
Midfield seems to be a weaker area for them. Milner is getting on and having less game time. Henderson is a decent, but average sort. Fabinho is one of the best around for that position. Thiago looked a good signing, but doesn't seem to play much and Keita shows real brilliance at times.
"they have an ageing team".....but they also have a lot of promising younger players coming through. Jones will make it, but I think he's a bit full of his own importance at present. Elliot looked a top class player in the making until his injury. Morton and Gordon look like they should be able to break through as well outside of cup games.
They'll buy and strengthen again, and although they don't splash big, they do buy and sell shrewdly. I think Robertson cost less than ten million. They have the patience to wait for the right player, as in van Dijk and will spend if required, with Alisson for instance. They won't blow money on names like Mbappe or Harlaad, but might if they met all the criteria. It seems to me that they operate as a team, as a 'collective', and although a player may have outstanding abilities, he would have to tick all the boxes, both on the pitch and off it before an effort was made to sign.
Very different to the boys in red across the road and you can see how they have fared with that approach. Pretty Boy may still retain a lot of ability, but he doesn't fit the team........mind you, he does help sell shirts, although as far as I am aware, I don't believe shirt sales equal trophies.
The owners have a business plan and Klopp knew that when he took the job on. To say that he's only building for today is ridiculous and clearly not evident, the biggest concern I can see is down the road and who takes over from him.
If he progresses as he is and does well with Villa, then it will probably be Gerrard. However, he won't get the job by right, he'll have to prove himself and earn it.
You don't become successful businessmen based on sentiment.