[Von Due]

A couple more found on this widest of webs

"The children now love luxury; they have bad manners, contempt for
authority; they show disrespect for elders and love chatter in place
of exercise. Children are now tyrants, not the servants of their
households. They no longer rise when elders enter the room. They
contradict their parents, chatter before company, gobble up dainties
at the table, cross their legs, and tyrannize their teachers.

ATTRIBUTION: Attributed to SOCRATES by Plato, according to William L.
Patty and Louise S. Johnson, Personality and Adjustment, p. 277
(1953)."

"I see no hope for the future of our people if they are dependent on
frivolous youth of today, for certainly all youth are reckless beyond
words... When I was young, we were taught to be discreet and
respectful of elders, but the present youth are exceedingly wise
[disrespectful] and impatient of restraint" (Hesiod, 8th century BC).