norm vs age norm

norm and age norm both are nouns.

Word	Noun	Adjective	Verb	Adverb
norm	Yes	No	No	No
age norm	Yes	No	No	No

As nouns, age norm is a hyponym of norm; that is, age norm is a word with a more specific, narrower meaning than norm:

norm: a statistic describing the location of a distribution
age norm: the average age at which particular performances are expected to appear

Other hyponyms of norm include modal value, mode, median, median value, mean, mean value.

norm (noun)	age norm (noun)
a statistic describing the location of a distribution	the average age at which particular performances are expected to appear
a standard or model or pattern regarded as typical