Are both sentences OK?
Music has no age. (I mean people of all ages can sing or make music)
Music has no language.

Question

Are both sentences OK?
Music has no age.    (I mean people of all ages can sing or make music)
Music has no language.

Answer

"Music knows no age limit / range."

Answer

"Music has no language" is OK. It means "music doesn't need language" to communicate.
"Music has no age" is confusing. It sounds like "music itself doesn't own an age" which is not what you're trying to say. To say music works for all ages, try "music has no limits" or something similar.