Yea hes older but Im sure you can see youre driving her into his arms with the whole tough dad routine. Its not like shes a minor, shes an adult legally. Nothing you can do about it. Let her make her mistakes (if hes actually a mistake). Besides, you havent offered any reasons why he deserves to be beaten besides being a bit older and apparently a pretty good catch by what youve said. Theres a guy here Lartinos who is 30 or so and engaged to a 19 or 20 yr old (been together longer). Maybe you can pm him about it pick his brain a little.
Im 37 dating a 34 yr old by the way