So, I'm not completely ace, but I am 95% and seemingly get more ace every year that goes by. Thing is, there's a difference between sexual impulse and arousal on one hand and attraction to an actual person on the other. I get horny as hell every single month during my ovulation because my uterus is screaming and begging me to make babies, and that's usually when my once or twice a month masturbation happens. But the last time I met an actual real life person I was sexually attracted to was 4 years ago.

I can also find the idea of a person sexually arousing, but still won't find the actual person attractive. I know this from experience, because when I was much younger and didn't know myself as well I did act on the attraction to the idea of a person only to be sorely disappointed when it actually happened and I felt nothing.

This is only my own experience of course, but I hope this helps a bit in understanding it.