Even more interestingly lets look at the spread of ages of both teams. All the under 21s are above.
21-25 Arsenal - Diaby, Sagna, Fabregas, Senderos, Nasri, Eduardo, RVP, Djourou, Fabianski, Clichy, Adebayor, Eboue, Bishoff
21-25 Liverpool - Pepe, Cavalieri, Agger, Torres, Pennant, Arbeloa, Babel, Mascherano, Lucas, Degen, El Zhar, Skrtel, Itandje
Not much of a difference in terms of depth and quality there
25+ Arsenal - Almunia, Toure, Rosicky, Silvestre, Gallas
25+ Liverpool - Dossena, Finnan, Sami, Keane, Gerrard, Voronin, Aurelio, Alonso, Benayoun, Kuyt, Carragher
Much bigger difference there. We have moer players with more experience.