You didn't have 1 year, but you had 1 day old or 2 weeks old, or 3-6 months old,...

coldtea on Jan 20, 2021 | parent | context | favorite | on: Again on 0-based vs. 1-based indexing

You didn't have 1 year, but you had 1 day old or 2 weeks old, or 3-6 months old, etc.

People never said and still dont' say "this baby is 0 years old". They start at the first complete item of the lower level time units and progress from there...