[rootusrootus]

> After their 16th birthday, the person is going through their 17th year.

While that is true, does it not illustrate exactly the problem? Nobody ever says someone is in their 17th year when they are 16. That would be very confusing.

[dantyti]

People in my country sometimes do. As well as uni students, who always say which year they’re in, not how many years they’d finished.