Why Mexicans Have Wild Hair

One thing I noticed immediately about Mexicans was their hair. Mexican men between the ages of 10 and 40 must have the highest per capita consumption of hair gel in the world:





Even the humblest tamale seller in the street will typically be gelled to the nines. They sell it in big tubs at the market:

And yet, older men (even those who haven't gone bald) seem immune to this style; in Oaxaca, men over 40 typically wore a cowboy hat and brush mustache, while in Mexico City, their hair was more likely to be uncovered but nondescript.

Would love to know what accounts for this stark generational difference.