Tom Holland, Jake Gyllenhaal, Zendaya, Cobie Smulders, and Jacob Batalon were all on Jimmy Kimmel Live when Kimmel asked about the five-year time jump in Avengers: Endgame. If five years have passed for everyone, why are Peter, Ned, MJ, and others still in high school? The cast members looked at each other and laughed.
Article source: https://www.cinemablend.com/news/2471641/spider-man-far-from-homes-stars-are-confused-about-that-endgame-plot-hole