The former England skipper knows that, at 31, even some of the Goodison Park crowd are not sure if he still has what it takes.
They wonder if there is still life in those legs that have been terrorising Premier League defences since he was 16 and has he still got the hunger after earning millions over a trophy-laden 13 years at Manchester United?
And on his first Premier League game for the Toffees since 2004, the boyhood blue gave a resounding yes to both questions.
Not just with his match-winning header in the first half but also in the way when everything seemed to go through him when Everton went forward.
And even in the latter stages when fatigue had set in, it was Rooney putting in the ball-winning tackles and showing the maturity needed to see the game out.