People mature at different rates, people look for different things in a relationship, who's to say which age is right and wrong. There is a social stigma when it comes to middle aged people dating those half there age, particularly in men, but that's born from fear of the many unsavoury characters with an agenda that appear in the news.
I think that as long as intentions are legit and as long as there is a respect for the feelings and concerns of the family of whoever you are dating, age should not have to be a barrier.