Paul's problem has never been an inability to relate to young people. I'd venture to guess that a majority of his supporters are under 40. Paul's problem isn't his age, it's his message. Legalizing drugs and prostitution and cutting Medicare and Social Security aren't things that older folks are going too be keen on, and making gold money, and closing down military bases overseas are not things that most people care about.
I think the closing of bases overseas is a great idea that can get support, but that gold standard thing is wack-a-doodle. IMO, Paul's biggest problem is too often he speaks in superlatives and absolutes and doesn't convey a sense of rational compromise. Yes we need to close down
some of our overseas bases and reduce others, but he likes to use words like "all" and "every" too much.
Also, a lot of his economic rhetoric is either misstated or misunderstood (by him). Yes, the FRB needs to be reeled in and not given so much regulatory power, but to completely eliminate it and any central bank (as he has proposed) is just insane. Basing our currency on a commodity which other foreign powers can control is also an idea clearly not well thought out.