Most Helpful Guy
Every situation is different. You have to judge it for yourself.
There are 26 year old guys that might as well be 40 because of their demeanor and accolades. There are 19 year old girls that haven't grown out of High School. It could be a mismatch, maybe not.
Personally, I am open to dating much younger than myself, because I'm not the most mature 25/26 year old in the world. I've see 18-19 year olds that are way too immature and 18-19 year olds that might be more mature than I am. Again, be the judge.
Most Helpful Girl
Totally depends on the people involved. I started a friends with benefits type relationship with my newly turned 26 year old friend, right before I myself turned 20. We've known each other for 3 years and we're really good friends. It's not weird at all. I never really think much of the age difference. It was somewhat of a problem when I was still 17, but I turned 18 a few months after we met anyway, so it wasn't that big of a deal.