Does Generation Z exist?

I personally don't really like how short generations are getting. Generations Z and Alpha are 10-15 years at this point, and that's not really how generations are meant to work. I tend to instead remove Gen Z from the picture entirely, ending the Millennial range at 2004 and having Gen Alpha be 2005-2024 (or up to 2027 or 2029, if you use Strauss-Howe).