Jonny Evans admits Manchester United's emerging youngsters have shocked him into action.
The Ulsterman knows he faces a battle to keep his pace in Sir Alex Ferguson's plans.
"It is weird," he said.
"The average age against Tottenham was 23. I was just over on months. It has given the young players an incentive to step up to the mark.
"You cannot be a kid anymore and sit back and let things happen. You have to stamp your authority on the team."