The youth buzz has nothing to do with engineering potential.

Young people tend to be more free of external responsibilities: marriage, children, job contracts, consumer debt, professional associations, expensive educational entanglements, and so forth. This makes young people more available to take giant risks with less apprehension (they have less to lose).

There is also giant marketing buzz when an uneducated 18 year old female creates something vaguely interesting, but nobody cares when a 45 year old man creates something absolutely revolutionary until they old it in their hands. Case in point: Elizabeth Holmes.