Basically, you can ask that question about any characteristic in a dating relationship:
Does height matter?
Does weight matter?
Does background or nationality matter?
Does money matter?
Does degree of frumkeit matter?
I know of several instances where the girl was somewhat older than the boy (up to 10 years); or where the boy was much older than the girl (up to 20 years) and the marriages are wonderful with wonderful children.
Chazal, however, states that you’re asking for trouble when the fellow is old and the bride is young. Human nature says the young woman will eventually look elsewhere when her needs are not met.