Age is nothing. I have nothing against people dating 18 year olds when they are approaching 120, as long as everyone is upfront about the situation. True, women have the disadvantage in that their menopause marks the limiting factor in reproduction, while men do not have this absolute time limit. And, ugly men generally are less at a disadvantage than ugly women (which tends to get worse as we age). In fact, if science were able to erase the effects of aging, it would be no problem at all.
There are a few issues, however--dating someone that is more than about 20 years older or younger is like dating someone from another culture--the older member will have to adopt a younger attitude for it to work well (which may not be a bad idea--it often helps if someone that is 98 years old is forced to act 20 for a time). If the woman is something like 50 or 60, dating a guy that is 18, his immaturity could be an issue (this is not as much an issue when men date younger women, since the woman often looks at men for advice and stability). However, this is not an absolute barrier (nor should it be), any more than it would be to date someone from another country or race. Of course, with the problems the witlesses create, a younger man/older woman is going to run into more issues with that damn headship issue, if he insists that everything she does is what he tells her to.
One exception is when the hounders are in a hounding call, set aside the children, molest them, and then order them to keep quiet about it or get disfellowshipped. This is initiatory force and threats of force, besides being RAPE. In those situations, the pedophiles need some jail time.