Since this is in relation to relationships and not punting, not sure it means much in punting context.
For what it is worth, I think the graph is rubbish.
A 25 year old can date a 43 year old, and it work.
A 19 year old can date a 31 year old, and it work, when it works, as long as everything is legal, who is to say it is wrong!
I like older men, always have, and am under 30,this will never change, so when I am, say,45 years old, I will just scout the nursing homes for a sexy older man.