There is no age appropriate music...
There is only exposure,education, ears training...
When a child i was going to Catholic masses and Vespers and ceremonies, I even worked as a boy altar...
My mother and father were singing "Ave Maria Stella" as i was a baby, and i remind it clearly and i was 2 years old or 3 max, then i listened to choral music at the Radio before noon( very old french and english folk song or popular chorus songs).
Then when all my friend listened Cream and Beatles and Hendrix, i was listening ,Monteverdi, Gesualdo, Josquin Des Prez, Jakob Obrecht, Purcell Anthems, and Bach etc...
Training ears biases when a baby will determine your music journey...
It was so strong conditioning, i discovered Jazz only at 35 years old...I decided it was not an inferior music style no more because i discovered music is done by musicians not written for singing by great past Masters...
Already in my twenties, i listen Indian sitar... It becomes after my 35 years a passion for Indian and Persian music especially .,..
Today i listen to many world musical cultures...
But the Choral music stay my all time favorite...
I like Armenian and Persian songs ...
Popular music has no real appeal to me save few poets exceptions (Dylan Cohen Baez, Ferré, partly because i was a "hippie" against war in the 70 etc )
Alas! if i can wrote a book about Bruckner symphonies describing them in metaphors i had no talent for music at all ...I was discarded from the Choral of boys because of my unability to sing correctly...
I "see" music with my eyes and do not hear it a way a musician hear it...
In my next life i want to play piano as Ervin Nyiregyházi playing Liszt... Or as Sofronitsky playing my god Scriabin...
if not i did not come back here ...