Barcelona has great players and they always work well together. For example, Lamine Yamal and Lewandowski work well together even though Yamal is a young player and Lewandowski is a senior player. This is the greatness of Barcelona, which always has great players and all players can work well together. Of course, Rashford can also play well and adapt quickly even though he has just joined the team.
It's absolutely true that since Hansi Flick joined, Barcelona has improved even more, and Barcelona certainly made the right choice in appointing Hansi Flick as their new coach. Currently, Barcelona is not yet in a safe zone, so Flick must work to make the players even better. However, Barcelona has managed to reach the top of the standings again, which is a good start. The El Clasico match will undoubtedly be more exciting, as Real Madrid will certainly aim to win and overtake Barcelona's position at the top of the standings. Unfortunately, there is still some time before that match.

Yeah, obviously it's not about the age it about the quality. Yamal Jamal is special talents, he has a very good capacity to gain more tech from the senior baller. Besides, all players work extremely well together and try to pretend to be a one-team army..... Besides that, Marcus Rashford is also adopt Barca style of play and I hope soon he will also be there to make more sense.
It also true that whenever Hansi Flick came he just made the team outstanding. Literally he just switch the team play into prey hunter-like all the time they just banged up their opponent with impressive creativity.