It depends on your age. When you're 25, 15 years is a big age difference. (And not legal, if it's 15 years younger........
) but when you're 50, it's not such a big gap.
I'm 9 years younger than Bob. But he was 44 when we met, and I was 35. So it wasn't such a big deal.
When my daughter was 19 and engaged to a 30 year old guy, I wasn't quite as delighted.
I have a great friend who is now in his mid-60s, and he always wanted to be with a woman around 30. He told me straight out, "Women fall apart when they turn 40". He took me out (as a friend) for my 40th birthday, and jokingly looked over the dinner table at me to watch me fall apart in front of him.
He's a bit over the "30" thing now, but his current girlfriend is about 40.
I told him that he is shallow and stupid. He laughed, and agreed. But he still likes women to be 25-30 years younger. Incidentally, he has never had a really great relationship or had a partner he felt that would love him for who he is. One time, he told me that he thought a girlfriend "only wanted to be with me for the money" after putting $22,000 on his Amex card that month.
I was like, "Duh! You think??????" and he said I wasn't very supportive.
Luckily, he is extremely wealthy (he has a plane, a yacht, etc) so he can buy love if he wants. But he has never felt that he has had a true meaningful relationship. Of course, he's been pretty satisfied with the shallow relationships up until now. But at some points, he does find himself alone and lonely for a true companion.
I think age doesn't matter in a relationship, if the people are well suited. But I do admit that I knew a neighbor in Texas had a ton of money, because he was kind of old looking and beat up (but nice) and had a hot 19 year old girlfriend.