It is alright. A 99 year old can date a 101 year old( i doubt they would be anyways).
Let's say: 67 year old woman goes out with a 29 year old man. That's bad. 13-15, not so bad. 56-14 Problems lie within that range.
I don't really know why a 14 year old would want a 56 year old (there are weirder attractions I've heard of though), but once again is the 56 year old manipulating the 14 year old? Probably so. Does the 14 year old know of this manipulation? Probably not. And do either the 56 or 14 year old have the level of maturity to even conduct a proper relationship of this kind? Probably not.