2 ms·

I’m not sure where you’re from; I’ve lived in various continents - nobody starts counting things like “weeks” from 0.

• cyberge99 5y ago
  Birthdays are counted from zero. When you “turn” one, you’ve completed that year.
  • asalahli 5y ago
    That's because "birthdays" we celebrate are technically birthday anniversaries. Hence starting from 1 year after the actual birth day