PDF: http://homepage.psy.utexas.edu/homepage/group/busslab/pdffiles/SexDifferencesinHuman.PDF

37 samples, 33 countries, 6 continents and 10,000 participants.

Conclusions

Each of the five evolution-based predictions received some empirical support from these data. Females value the financial capacity of potential mates more than males do. Ambition and industriousness, cues to resource acquisition, also tend to be valued more heavily by females than by males across cultures. Support was strong for the financial capacity prediction (36 of 37 samples), and moderate for the ambition-industriousness prediction (29 of 37 samples).

Males value phsyical attractiveness and relative youth in potential mates more than do females - sex differences that show remarkable generality across cultures.

Not specifically predicted was the finding that females prefer somewhat older mates in all 37 cultures. this finding, in conjunction with the known positive correlation between age and income among males (Jencks 1979; Willerman 1979) provides additional circumstantial evidence for the hypothesis that females prefer mates who show characteristics associated with having a high providing capacity.

Note that a lot of this information was obtained via survey - it can always be questioned how our perceived preferences are much different from actual preferences.

One thing that was pointed out without the use of surveys was that marriage records (which was only recorded from 27 countries) found that all the countries (on average) had wives younger than their husbands. If you want numbers, you'll have to go hunting in the link. Because I am lazy.