Do you think generations are too long?

Millennials are from 1981-1996. I feel like it’s weird to lump me, a 24 year old, in with a 40 year old. I don’t have many shared experiences or anything with them. My dad is 41 lol

Like Gen z is 1997-2012. Are you telling me 23 year olds have things in common with my 8 year old sister?