If you write an order numerical using numbers and letters, then you need to write:

"5-year-old" (Can not: "5-year-old")
"5th", "2nd" (Can not: "5th", "2nd")

In particular, you can not write a quantitative numerical in the format "5". If it is quantitative, it simply writes one number without any "t", because it itself is read as "five".

This is another scream of the soul.
If everyone doesn’t see it, I’ll kill somebody.