Federer's peak years were 2004-2007 when Djokovic was 16-20 years old and he did start meeting Federer in Slams when he was 19 so you're being quite disingenuous there in asking why he wasn't meeting peak Federer.
So yes, the closer the match is the better it is for Djokovic and that has nothing to do with age.
I’ll just leave this here.
Your presumption - from your earlier post - is that because post peak Federer lost tight Bo5 matches against Novak, then all this talk of “what if” hypothetical re age gap is none sense.
So…Look at Novak’s results against Federer in Federer’s peak bud. Is that age?
Additionally, We might as well ask - why did Novak have so much trouble with post prime Federer? Why did he need 5 sets so often?
Circumstances - You cite Rafa being in Novak’s draw at Wimbledon in 2007 - why did Novak not beat his peer Rafa? Fed did.
And what about the other years?
Haas? Another of Fed’s weak era pigeons? The ATG Berdych? Why did Berdych stop a guy who’s so much clearly mentally together than Fed?
Roland Garros - so What about the FO in 2009 and 2010 and 2011? Did Rafa stop Novak there?
Fact is - Novak never dominated Federer in Fed’s peak and it was well after Fed’s best years before he was able to dominate Federer.
Why is that?
If it’s not age, then what is it?
If it is age, then why does Federer get labeled weak mentally for not only beating everyone around him later in his career except two ATGs 5-6 years his junior, but being able to push them to 5 - and even take them out on occasion?
Some how Novak is a hero for needing 5 sets against a guy 6 years older who is a mental midget. And Fed is a loser for pushing him hard instead of losing in 3.
It’s like the Peter fans who laud his 7-0 record in finals over Fed’s 8-4 record in finals. As if losing in the 2nd and 4th round is somehow greater than fighting to the very finish.