I must tell you that I have a thing for older women
Oh really now? What's good about older women?
I just can't help myself, I'm helpless in this situation.
Attraction can be complicated but being attracted to somebody just because of their age is not right if that's the only thing you care about. People who belong to certain age groups are not all alike.
I just want her to like me.
Just because she is older, doesn't necessarily mean you are attracted to all older women. How about trying to judge her a little more on her character instead of age? If you truly like her, how about bringing up some small talk, it might actually work!