I don't think this is a valid argument. I have noticed that you have used players with greatest longevity in the history of the game as some sort of measuring stick previously which makes little sense as they are in the top 0.5%.
This is the list of association footballers with the most appearances of all time.
https://en.wikipedia.org/wiki/List_...ll_players_with_the_most_official_appearances
They include under age international caps, so Rooney at 31 is currently on 774 appearances. There are 13 goal keepers in the top 50 so I would bet that by the time Rooney's career is over he will be in or close to the top 50 of out field players in the history of football in terms of appearances, that is from the what, hundreds of thousands of professional players to play the game?
This article from The Guardian states that the average footballers career is 8 seasons.
https://www.theguardian.com/money/2010/mar/20/professional-footballer-career
So lets to a very top end average of 60 games as season = 480 games in an average career.
Lets not forget that Rooney had 77 senior appearances by the age of 18 too.
The idea that Rooney hasn't had a long and hard career that couldn't have taken a toll on his body naturally, I just don't see it. I don't think there is reasonable evidence for it.