What does the 80 year old level means? thanks

What does the 80 year old level means? thanks

The level of someone who is 80 years old;

“ year old” is used as a noun to refer to someone of that age. I think it normally has a hyphen joining the number and “year”:

He is a sixteen-year old. (He is sixteen years old.)
All the 5-year olds are playing together.

And in English, of course, when two nouns are used together in the same part of the sentence, the first usually is used as an adjective:

I like birthday parties.

So in the same manner:

the “80-year old” “level”