On Monday night before the Brewers game, a commentator on ESPN said something like "now that Fielder is entering his prime years, his numbers will surpass those of Albert Pujols." This seems hard to believe. Fielder generally has not hit as well as Pujols at the same age.
The table below shows how each guy hit by age:
So far, at only one age, 25, was Fielder even close to Pujols. From 21-26, Pujols had an OPS+ of 169. Fielder had 139. The table below shows the offensive WAR for each guy:
The next table shows the neutralized stats for each guy (all data hare is from Baseball Reference):