An age gap is easy to count.
The relationship impact is harder to measure.
Ten years can mean very little between two established adults.
The same ten years can represent different stages of education, career, fertility, income, social power or life experience.
The useful question is not only, "How many years apart are we?"
Ask what the gap changes.
Life stage matters
Are both people building careers?
Is one retiring while the other is still growing a business?
Does one want children soon while the other wants to wait ten years?