We do the same with people's ages. For the entire initial year of your life you were zero years old. Likewise, from years 0-99, zero centuries had passed so we should call it the zeroth century!
At least this is how I justify to my students that zero-indexing makes sense. Everyone's fought the x-century vs x-hundreds before so they welcome relief.
Izzard had the right idea: https://youtu.be/uVMGPMu596Y?si=1aKZ2xRavJgOmgE8&t=643