Furthermore, speaking of Real Madrid, you're right. Real Madrid can't continue to rely on their aging defenders. Their performance is certain to decline and they are also prone to injury. Therefore, Real Madrid must bring in new defenders to strengthen their defense and improve. However, after I investigated, Real Madrid has actually brought in three new defenders: Dean Huijsen, Alvaro Carreras, and Alexander Arnold. All three players are quite formidable defenders. So Real Madrid should be able to strengthen their defense even more with these three new players.
Huijsen is a promising central defender while I don't know of Carreras and Trent does not have good defensive skills. Real Madrid surely knew defensive weakness of Trent and they perhaps plan to use Trent mainly for attacking support. Real Madrid will not accept to lose La Liga title to Barcelona again and they are improving their squad with new players.
Barcelona have a young team that can grow up more but their brightest star player Lamine Yamal shown some signals of being distracted by parties and unhealthy living styles. This can harm Barcelona attacking power in next seasons and give Real Madrid kind of good opportunity to not only challenge Barcelona but also take trophy back.
Yes, Huijsen is indeed the defender with the most outstanding abilities compared to the other defenders Real Madrid has brought in during this transfer window. However, I'm confident that the defenders Real Madrid has brought in this time will form a strong defensive wall. Real Madrid is a team with excellent analytical skills. So, they wouldn't have signed players without a clear vision if they hadn't shown promising performance. At first glance, it might be true that Alexander and Carreras aren't as good at defending as Huijsen. However, I'm very confident that under rigorous training at Real Madrid, both defenders will be able to unleash their best performances, ones that may not have been seen at their respective previous teams. So, I'm very confident in that.
As for Barcelona, they do have quite promising young players at the moment. La Masia is always ready to bring out young players with great talent. So, with that in mind, Barcelona's player resources are certainly very good and there's no doubt about it. Then, speaking of Yamal, who frequently throws parties and is often seen on vacation, I also assume this will negatively impact his performance on the field. However, Yamal is a very talented player. So, if he maintains a good training regimen, I think his performance will remain excellent. Besides, it's natural for Yamal to go on vacation and throw parties. Because now is the holiday season.