If there are five films with an actor under 25 playing Peter Parker in high school (which is certainly possible if you factor in Captain America 3, and the two parts of Infinity War) film audiences will be exposed to a lot of content with a rather young Spider-Man. That could alter the perception of the character, who had at least been a college student in most adaptations.
Granted, if the films show Peter Parker progressing over the course of a decade, there might be a different impression of the character as a hero who grows up and keeps having adventures (The Raimi and Webb films aimed for this, but stumbled in latter efforts.)