Why not 20th Century being 2000- 2999?
In: 0
Your 1st year (the year following your birth) ENDS with your 1st birthday.
If you are 24 and 3 months old, then you have already lived 24 years and are now in the process of living your 25th year.
The centuries work the same way. The 21st century will END with 2100.
This can feel a bit confusing, which is why many mathematicians and programmers begin lists with the “0th” element rather than the “1st”. It’s a mental shift that fixes a lot of these weird confusions.
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