Salah said Madrid did not have the money to sign players in this transfer window.
Salah? Why did Salah comment about Real Madrid financial status? 
Real Madrid has no problem with financial status, they can sign any players with their money. But Ancelotti isn't a typical coach that is very active to sign new players, especially when he thinks he already has a good squad. Don't compare Real Madrid with Barcelona, Real Madrid is an established club with good financial management.
I might feel that Ancelloti still likes their current squad with the majority of its young players.
I think we can't say that Real Madrid squad is the majority of young players. The players' average age is 27, it is not a young age. Moreover, there are many key players of Real Madrid who are more than 29 years old. Benzema, Modric, Kroos, Casemiro, Alaba, Rudiger, Carvajal, and Courtois are no longer young players.