I also think that 'in love' age should not be an obstacle, a 10 year gap between a 16 and 26 year old can be a bit of an eyebrow raiser, and even a 17 - 27 year old.
My Dad was 12 years older than my Mum which I [think] I thought was unusual, but looking into it, I see years ago [in their time] it seemed like quite a common age-gap.
There was in interesting article not that long ago on the BBC:
dunno. I've only dated people within a two year gap. I don't know why people obsess over this question all the time...if you aren't sure about it, why do you think asking a bunch of random people who also don't have the answer will help? Listen to your heart, or your brain...but listen to yourself, only you know what's right for you.