Younger top here.
I only got turn on by older guys (at least 10 years older) and I am a top (for now, always wanna become versatile but I don't find pleasure when trying out anal toys). Growing up I thought I would be a bottom with my older guy attraction due to all the gay porn stereotype, but my first sex with me fucking an older guy totally changed my perspective - the older bottom came handsfree and that was so hot. He was surprised that was my first and told me to keep on being a top, and here I am.
I will say not all older guys are willing to be topped by younger guys, but I don't mind it as everyone have their own preferences.