Parker started out 15/16-ish in the books. Marvel hired Tom Holland and looks closest to that age, which is a departure from Sony's Tobey Maguire and Andrew Garfield. Maguire and Garfield had youthful appearances but Holland looks definitely like he's a year or two short of reaching 18.
On the other hand, Sony started out with Rosemary Harris, who has the GRAND-aunt appearance of the original May Parker but then made her look still very mature yet somewhat younger with casting Sally FIeld. I'm not sure who started de-aging Aunt May first, Sony or Marvel, but Marvel had started doing so in cartoons (not sure about books) during the past decade or so. Obviously, they like the idea for better marketing the upcoming film with Marisa Tomei.
I like both approaches. Spider-Man looks like a kid starting out like Stan Lee helped created him. Aunt May looks more like the sister of Parker's late 30's/early 40's parents instead of his grandmother. Then again, 'sexy' Aunt May may take a little getting used to.
Slightly off-topic - nice short interview with Stan Lee about Spider-Man, etc.: