here is my two cents:...
speaking as a woman who has a relationship with a man 12 years older than her..i too am making a big deal about the age difference--not because we don;t get along, but because of life stages. it's really hard to explain it to him. he's already done so many things, established himself, and i'm still unstable, uncertain, exploring ect. he wants to settle down with me and have a family, and i'm still wondering where i would like to live (anotjer country possibly), stabilizing my career, moving out and becoming financially independant ect. there are sooo many things to consider..i'm freaking out.. lol
it also depends what type of personality and character you both have. in my case, i enjoy being in the public, socializing, meeting new people all teh time (because of my work too), and he's more critical of people, is quick to judge, isn;t as loose as i would like him to be.
another thing that i think of is how things will change in the next 5, 10 or 15 years down the line? i'm 26, he's 38. when i'll be 30, he'll be 42, when i'll be 40 he'll be 52. i'll still be energetic ect, and he'll want to retire..i don;t know..!
anyhow, all this to say that as someone who is the younger one in a relationship like the one that you are describing, it's also difficult, and i think age is an important factor to consider. from a practical and logical point of view. now the heart is a completely different story..