Wow. Just wow. The bolded parts. Come on, man
First of all, he's 28, turning 29. He's not old just yet. He should be in his prime right now, and will be for another few years. I really don't think he's shown any signs of a decline. I actually think this season he's redeemed himself a bit. As long as he can stay fit, he'll be spectacular yet again.
Which young player of ours deserves/ are able to play on the right? And which young players of ours are world beaters and ready to take us to the next level? We desperately need a right winger. Because right now, the only right winger we have, is Mata. And he's not exactly young, neither is he really a right winger imho. Have you seen Marcus play on the right? Spectacular stuff. And Martial? I don't know about you, but I would rather play without wingers than play him at RW for 40 games next season. He's just not a RW. Lingard? He's 25 years old, and not really a RW either. So which young RW are you thinking about?
Sure, we'll free Real Madrid of "dead weight" as you put it. But as
@Judas says, it will be mutually beneficial. He would improve us drastically, and they get rid of a player who's out of favor with Zidane. There might be more reasons to him being out of favor than "being on the wane". Zinedine Zidane prefers to play Isco over Bale. If we can get Isco, I would be just as in favor of that, as I would be to us signing Bale. For all I care, get them both!
And when you start comparing Bale to Rooney (I suppose you mean the Rooney of 2015 - 2018) and a second hand Delorean, you just look silly.