Dating older men

So I am 20 my love is 33. I don't see why people frown upon us in public. I look very young because I'm petite but I just don't understand if this was the norm in our grandfathers time. The only problem I noticed is sometimes me and my so argue about stupid stuff because I guess I'm younger and hes always telling me be realistic. Can anyone tell me pros and cons of dating older. Please be detailed like how is arguments, marriage, etc. Thanks everyone.