Normal Or Abnormal? My Desires For Older Women

Well I don't want to believe am the only one this is happening to(right now)! It can't just be a custom-made issue that centres on me.
Am in my late twenties, in fact am already staring at 30! I was de flowered by a girl of 8years difference, my niece, (she was actually a year older than my bro). She came to live with my parents when I was less than 6(now married with kids).
I can vividly remember that all she ever wanted was a space to explore her new sexual style; hence I was almost turned to a s.e.xx t.o.y !
Never told my parents not even my siblings, kept this all to myself till now! Having grown up with sexual assaults and rape from older ladies(our next door neighbour too), this has really culminated into an uncontrollable desires for older women!
Ever since I became matured and starting having girlfriends, as a matter of fact am yet to date a younger lady, never in my life have I slept with a lady am older than! Presently am dating two girls one is 7years older and the other is two years older... Though the latter looks way older than the former, as she has a giant stature...
Deep within me my heart is for the 7rs lady cos I can't just explain it. But the second one was the one that initiated it... She has this heavy crush on me. Hence, she is playing mario and she also knows about my lady.
I don't do sugar mummy stuffs... Am just attracted to older girls not mummies!
I once dated my sister's friend(3yrs diff.) Which everybody knows about in my area then!
I came out to ask this, because all is set for the big thing to happen this year(with the 7rs old lady), we've been together since july '12
Pls is this normal?