Re: Decades of experience
"Where does [sic] the decades of experience come from?"
The voting age in the U.S. is 18, so only those voters below the age of 28, constituting a minority of the voters, will be lacking decades of experience. Thus it is true to say that the majority of voters will have decades of experience.
"Most people don't spend decades assiduously following politics..."
Whilst most people will not have assiduously followed politics they will have lived through its consequences and formed opinions on the basis of their experiences; this, essentially, is how all people decide how they're going to vote.
"...usually they don't give a shit until election time and then get quickly bored..."
I think there's more to it than just getting bored - I think it's more to do with the realisation that, when the only options are a douche or a turd, it's impossible to make a meaningful choice, and if you think your choice has no real meaning then it's difficult to see any point in it. Doesn't help either, that both the douche and the turd have a mutual interest in preserving the system that ensures you only get a choice between douches and turds.
So no, I don't think the problem is due to a lack of interest or motivation on the part of the voters.