My husband is 11 years older than I in terms of birthdays, but emotionally we are the same age, except when he acts younger. Then my grandparents were 16 and 30 on their wedding day. I also have a friend who was born when his dad was 70 and his mom was 35. And then there are Demi Moore and Ashton Kutcher, 16 years apart.
I suspect that once you get to a point where you have figured out who you are and what you want to do in life, age differences matter less. However, we are still trapped by biology. If two people want to have babies together the female needs to be younger than a certain age, while males have a wider latitude.
Otherwise, if two people love each other, have common goals in life, and are wise enough to be able to accept each other and grow together, age doesn’t really matter once everyone is above the age of consent.