Be honest - do HUGE age differences in marriages/relationships creep you out? I'm talking like 10+ years.
I think it creeps me out more when its an older woman with a younger guy but older guys with younger girls makes me cringe as well.
There is a woman in my son's cub scout troop who is dating a guy who has got to be at least 15 years younger than her and he even admitted at a recent camp out that he was not old enough to physically be her daughter's dad. They aren't married which makes it even weirder for me on camp outs because they (obviously) sleep in the same tent and one of the other parents actually mistook him for her son.
Another one of my guy friends from college married a lady in her late 40s with kids in college and we're barely 30. She posted a pic of herself sans makeup on Facebook (seems to be the trend today) and I'm like... eeeek! I mean my friend definitely wasn't a "ladies man" in college but I didn't think he was desperate enough for love that he'd marry someone that much older than him. Reminds me of American Pie (though at least the mom was pretty in that movie)