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Pena isn't even old unless you expect him to age early. He had an expected BABIP of around .280 considering his peripherals (career BABIP of .293), meaning his OPS last year should have been in the mid 900s.
Sexson WAS unlucky in '07 (though he deserved around a .250-.260 BABIP that year) and then just bad the year following even though his BABIP rebounded to .270+ (his peripheral skills continued to decline).
Sexson's peripherals started declining in '07. He was both worse AND very unlucky.
Pena just posted the 2nd highest IsoP of his career and hit 39 HRs in 80% of a season.