polly,
At that time, no ages were given in the register, nor were parents' names. It should tell you if either one of the pair came from a different parish, whether they were single. Provided neither of them had told fibs, you can assume that they were both of age (i.e. 21): if they were considered minors, then strictly they need the consent of their parents and this should be shown. A father might be a witness but he would not be identified as such. I have checked the Sussex marriage Index and it gives her name as Emily, so two possibilities to look for.
Nell
