Age 5. Interestingly enough, this is the age where I have my earliest memories.
Didn't know anything about sex or what sexual desires were, I just remembering suddenly finding certain women I saw on TV "pretty".
Piggybacking off of what
@010101 said, I had female relatives in my life at a young age who gave me love and attention, so I was drawn to being around girls for the calm, feminine energy on a subconscious level, I believe. Like most boys in kindergarten to a degree, the ones in my school tended to be obnoxious, loud and annoying.
I never had a phase where I thought girls had "cooties" or went
if a girl wanted to play with me on the playground.
My first crush was on a girl in my kindergarten class.
Her name was Victoria.
She was Italian.