the.com/19
The number too old to be a kid, too broke to be an adult.
means The natural number after 18 and before 20, and the last of the teenage years.
from From Old English 'nigontiene', literally 'nine-ten' — Germanic math spelled out loud.
Prime statusA prime number, divisible only by 1 and itself.
Metonic cycleMoon phases repeat every 19 years almost exactly.
Last teenFinal '-teen' before adulthood claims you at 20.