> Customers dictate what gets produced.

Sure? It seems to me that the companies dictate what I consume. Many many times I wanted to buy exactly the same clothes item or shoes to replace an old one (because I know exactly how it'd fit and wear) only to discover it has been discontinued with no obvious "heir". Sometimes only 6 months later...

Whats the percentage of people chasing "fashion", especially after mid 30s?

More accurate to say that it's the other customers that dictate what you consume, by out voting you with their wallet.