Perfect pitch is impossible to learn especially since I'm 19 years old but I have heard of people who developed perfect pitch on their instruments. For example, Aimee Nolte is able to listen to the piano and just know what the notes are, and Robert from the Living Piano states that he could tell what notes are being played on the piano and the french horn. but they cannot just sing an A off the top of their head like a person with perfect pitch can.
To practice this I've decided put time and effort into singing fixed chromatic solfege, scales, modes, chords, and Bach's 2-part inventions, both left and and right hand.
Do you think, being 19 years old, I will be able to develop this innate ability for the piano using this method?