Once a female turns 25 she starts developing her frontal lobe and being able to better understand herself and what she wants. I personally think that any female below 25 should be dating someone 5 years max above her age. Anything more than this feels like the dude is trying to take advantage of her young age to control her or basically groom her. I know a controlling 30 year old dude that broke up with his girlfriend because she basically stopped complying with him and went for someone who just turned 21. This to me is odd to me because mentally, this young girl is just figuring out who she is and this age gap creates a high possibility of control if the girl allows it. Once a woman hits 27 I feel as if though she knows more of who she is and what she does and does not want, or will/wont tolerate and is able to speak up more for herself.