Shuddertothink, an old friend of the site -- even if he is Bitter and Blue -- has some great work that I wanted to point out: He's broken down the top 45 strikers in the Premier League by the numbers, by the averages, and by age and performance. It's terrific work so be sure to check out each of these three links.
Quite predictably, I immediately sought out to examine Robin van Persie, Wayne Rooney, and Javier Hernandez (Chicharito) -- and the numbers somewhat revealed what I expected: RvP and Chicharito are incredibly efficient while Rooney's numbers aren't terrible for a down season. It makes you wonder about the Mexican international if he was able to get more games -- he might be able to provide a top club 30 goals a season if he played regularly because he's sensational at converting chances.
The age and performance numbers are interesting as well. RvP, age-wise, appears to be an anomaly for what he's recently achieved. However, his past injury history and somewhat conservative upbringing at Arsenal by Arsene Wenger may actually have resulted in him having less wear and tear than most elite strikers at his age -- perhaps he can still provide us world-class seasons (or a level close to it) for the remainder of his contract. Rooney is in age where he should be in his prime but he's already began to decline in recent seasons -- and, when examining the data, it doesn't seem promising that he will suddenly improve in a season when he's about to turn 28-years-old. RvP reached his pinnacle by the ages Rooney is coming into, though, so that's worth considering. But using that as hope is an obvious fallacy.