Hello again Joyce, Just one more follow up and I will leave this issue alone. I looked up the family search and found three records.
Anne Gustin, birth 1754, spouse Simeon Duun. marriage 1772, Sussex, new Jersey.
Ann Gustin, birth 1756, spouse Simeon Dunn marriage about 1773, New Brunswick, Middlesex, New Jersey
Ann Gustin, birth about 1753, spouse Simeon Dunn marriage about 1773 New Brunswick, Middlesex, New Jersey
All of the reports were submitted by members of the LDS church. No additional information was available. Maybe you have looked these up in the past.
The dates of marriage sound reasonable, 18yrs vs 12yrs.
Evidently Ann lived in the Township of Frankford which is near Newton, New Jersey. The report I referred you to seems to be quite bland in relation to presenting real facts as to the identity of Ann Gustin. It sounds almost like "trust me, I did all of the research".
Anyway, I wish that there was more information about this relationship. I have run out of options on this one and will have to believe, not a good thing for genealogists, that the two must have gotten together and liked what they saw. I have very little information about Simeon. I hope that this information will help the both of us.