Agree. Juventus must sign experienced players but not too old players. I don't know if Motta already makes a plan for buying some players. However, he really needs to rebuild this team because the squad looks not really promising. TBH, I don't understand why Allegri could build weak squad in the season 2023-2024. It looks like a squad of average teams.
Juventus has so many players who are over 30 years old. This needs to change immediately. They need to evolve into a more dynamic team to fight harder for Serie A titles. Football is changing and dynamic teams are one step ahead now. 
Motta is a young manager which is a plus for Juventus about this topic. I wouldn't expect him to prefer old player signings much. His system would also be different from Allegri probably. But before anything else, they need new transfers like I said before. If they sign midfielders who can contribute much more to scoring, it isn't too difficult for them to stay in the title competition until the final moments.
They start the season great, but gradually become more and more tired, and that shows in the results as well. They need a younger setup, at least younger bench, so that they could end up with some subs during the games that could help them. If they keep this old age situation going, then I am pretty sure that we are going to see them not do all that well, they will be pretty bad.