Where did all these newspaper/magazine writers get the false idea the decade ends this year?

There was no year zero, so the first decade would be years 1-10 therefore this decade is 2001-2010.Where did all these newspaper/magazine writers get the false idea the decade ends this year?
It is just sloppy math. People refer to decades as the 20's, 30's, 40's, etc. so they conclude that a decade only includes only the years that begin with that designated number.Where did all these newspaper/magazine writers get the false idea the decade ends this year?
What is the first year of a century? Count to ten. The end of an 09 is ten years.
cause generally it is from the 00 to the 09 type of years that people focused on


ik i reconized that too