I think most people here have talked to different Adcoms, thats why many say that Age matters and others say it doesnt.
I remember talking to one Adcom from a very highly ranked school, and out of nowhere he said, "this surprises some people, but age makes a big difference".
After checking some of the MD Apps on here, I can say that I have never seen a applicant younger then 20-21 get accepted to this school.
Think of it like this, why choose a younger applicant when there are other people with 3.7+ gpa, good MCAT, and Excellent Ec's (that they have had the time to work on).
I think that If your ready, then dont waste any time and get started on your medical education because only you know if you are going to truely enjoy time off, or if your going to just waste that time that is better spent in medical school.
But people need to STOP saying that age doesnt matter, because it does.