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Salah currently was 30 years old and his performance also decline so i was wondering why Real Madrid want him because if Madrid want looking for the replacement of Benzema i think Salah isn't the right player for them because in my opinion Madrid should be buy younger player than him
Salah is certainly a respectable player, but I don't think Real Madrid would want to sign him. I am 100% sure that they will want to sign young players with high potential such as Osimhen, Leao and Kudus (Kudus is my favourite). Salah will most likely be transferred to one of the underdog teams after playing for Liverpool for a few more years. I don't think he needs a new challenge. He is a football player who has completed his career to a large extent.
Real madrid has some good wingers. Real didn't even need salah. Just a match against everton has not proven if salah has been going back to his best performance again. Real madrid needs a striker like osimhen. I didn't prefer to see real madrid to take leao. Leao's performance is not as good as osimhen. Osimhen has all of things that will be needed by real madrid. He gonna be a very good substitution for benzema in the future but the problem is as napoli stated won't sell him and so real must be trying so hard with it. Klopp will be trying to buy some new players to rebuild the club again.
You're right that Real Madrid has some excellent wingers, but I think they'd benefit greatly from adding Osimhen as a striker, who has scored 17 goals for Napoli. From what you've said, it appears that Napoli's desire to defend their league title will make them reluctant to part with Osimhen. However, Real Madrid is not known for splashing the cash like Paris Saint-Germain, so they might not make an offer that pushes the club beyond its financial limit.
Osimhen's future and potential move to a new club, IMO, will be determined by how highly Napoli regards him and how much a team like Real Madrid is willing to pay for him. Napoli may contemplate releasing him if Real Madrid makes a tremendous offer that meets or exceeds their expectations. The individual's drive and goals will also play a role. My guess is that Klopp would look into other possibilities to rebuild the club as you suggested.