This idea from Adam Grant (~44:16) is (also) great reasoning for why generations as marketing personas should stop.

We should stop defining people by their group membership. Instead of assuming that just because people came from a particular background that they had the same degree of difficulty and adversity. We should actually get to know the individual to find out the obstacles they face and adjust expectations.

Know your actual customers and fans. Use that to create an aspirational persona you market too.

Generation groups are lazy and dumb.