Comment by setopt
5 days ago
Personally I prefer to round 29 years 6 months up to «I’m now 30 years old». As you would expect to happen if you run round(29.5). For some reason, most cultures settled on either floor(age) or ceil(age).
5 days ago
Personally I prefer to round 29 years 6 months up to «I’m now 30 years old». As you would expect to happen if you run round(29.5). For some reason, most cultures settled on either floor(age) or ceil(age).
Which cultures settled on ceil(age)?
The traditional system in China and its surroundings, 虛歲, is that you're born at the age of 1 and your age increases on the new year.
As the sibling comment mentioned, I was thinking of East Asian countries.
There's another difference in that age++ there happens on Chinese New Year and not your own birthday, but that's an orthogonal point to the rounding, I think.