Wiktionary
ephebiphobia
n. An irrational fear of adolescent people.
Wikipedia
Ephebiphobia
Ephebiphobia is the fear of youth. First coined as the "fear or loathing of teenagers," today the phenomenon is recognized as the "inaccurate, exaggerated and sensational characterization of young people" in a range of settings around the world. Studies of the fear of youth occur in sociology and youth studies.