Well, I am in a relationship with an "older" woman and a "younger" woman, and I have to say that both have their unique charms.
That having been said, the "older" woman has a youthfulness, humour and energy to her that I find immensely appealing, and the "younger" one has an emotional maturity to her in terms of her core values that mean that our relationship is meaningful. Before I met her I never ever thought that I could have a relationship with someone that much younger than me, and was concerned that "getting old" would mean that we became staid and boring. I have chosen well (or been lucky, depending on your outlook).
Neither is better - they both have their wonderfully unique charms and I wouldn't swap one for the other for all the tea in China.
"Listen, or your tongue will make you deaf." - Native American Proverb