To our shock and dismay, we found that despite the omnipresence of the term "cool" there is no quantitative research that actually indicates what it means.
The rise of "hipsterdom" has turned cool on its head. All of a sudden you have people making throwbacks to all parts of historic culture in an attempt to be "authentic." You can pickle things or do urban beekeeping... and all of a sudden it's cool.
If you're a parent and you're over 50, your kids will not be duped into thinking you're cool if you imitate their clothing style, adopt their slang and embrace their culture.