The 18-34 age group is the one with the highest loyalty in consumption frequency.

something along these lines......I understand "aderência" to mean loyalty, following, etc.. in this particular context.


http://en.wikipedia.org/wiki/Brand_loyalty

The American Marketing Association defines brand loyalty as:

1."The situation in which a consumer generally buys the same manufacturer-originated product or service repeatedly over time rather than buying from multiple suppliers within the category" (sales promotion definition).
2."The degree to which a consumer consistently purchases the same brand within a product class" (consumer behavior definition).