When is age difference an issue?

I know someone who is dating a 19-year old. He is 46. She is not a mature 19-year old, and he frequently refers to their relationship, in joking, as babysitting. Besides sex, what is the charm in dating someone who you have nothing in common with regarding world experience, interests, shared interests because one person has not had the opportunity to experience these?

If you and your significant other have a signficant age difference, I would like to hear your comments on this. Or, if you know someone who is/has been in the same situation, was the outcome positive and meaningful, or transient and meaningless?

My immediate thoughts are that the relationship would be transient and not last very long, but I am willing to hear other opinions. Because hey, everyone’s different.

Thanks for your comments.