Jose Mourinho has warned his critics he will have "many more years" as a manager.
The Manchester United boss took his first senior post in 2000 and has led huge clubs including Inter, Chelsea and Real Madrid during a glittering career.
And the Portuguese, 55, says he still has the drive to be a success at the top level of football.
"It's my nature," Mourinho told BBC Sport. "I think if I was not a successful manager I'd be a successful something. A successful PE teacher, a successful... I don't know. I'd always be a person with drive with this nature.
"Probably the colour of my hair doesn't tell the truth. Maybe people think I am much older than I am. Maybe because I arrived in high level football very, very young maybe people think I am 66. I am not 66, I am 55.
"Even for the ones that don't like me so much, they are going to have me for many more years."
