Assuming the question does not refer to BC,
First century ended in year 100
Second century in year 200 so fifth century ended in year 500.
54 years before was the year 446.
vierundfünfzig Jahre
Every number divisible by four. Seriously.
It's Dictionary.
You would say "Il a cinquante-quatre ans" in French to mean he is fifty four years old.
fifty-four years
80 years
24.357 is twenty-four and three hundred fifty-seven thousandths.
Fifty-four point nine two Fifty-four and ninety-two hundredths Fifty-four ninety-two
Four centuries !
4.70
four hundred fifty two and fifty four hundredths
There are six!