When you are talking about older men and older women it is not an issue. But when you are talking 18, & 19 year old girls and older guys it is an issue. I know of these glick shidduchim who made it as far as 3 weeks before the wedding when both parties realized they had nothing in common and called it off. So we can all pull something out of our memories whether it worked on not, but it is not a good idea to begin with.
When you are talking about girls in their upper 20’s and boys in their 30’s they are both on a different level already and in a different maturity phase and life experience phase and age shouldn’t make that much of a difference at that point.