iPhone 14/Plus iPhone 14 starlight

[Guity]

hi, I was going to buy the starlight color iphone 14 but a doubt came to me, the white color by itself tends to yellow after time and so I was wondering if those white lines on the edges of the phone weren't in aluminum and maybe in some other material that turns yellow over time

 

[Sheepish-Lord]

What makes you think the glass back on the iPhones yellow over time?