I have never seen the year range stay the same between different places.
Outliers aside, most places seem to loosely agree that it goes:
Lost Generation - 1880s-1900s (Fought in WW1)
Greatest Generation - Early 1900s to mid 20s (Fought in WW2)
Silent Generation - late 20s to mid 40s (Was too young for WW2)
Boomers - mid 40s to mid 60s (Born in the post-WW2 baby boom)
Gen X - Mid 60s to early 80s (Born to boomers, experienced changing societal values, "latchkey kids," "MTV generation," etc)
Gen Y (Millennials) - Early 80s to mid 90s (Millenials, "Echo Boomers," shaped by rapid technological advancement/economic instability, birth of grunge/hip hop)
Gen Z - late 90s to undetermined end date (Can't remember 9/11, There has never not been an internet/wifi. TIDE PODS! YOUTUBERS! SOCIAL MEDIA!)