Mary Hoggarth was under 21 when she married, the marriage record, not IGI, states she married with consent of her parents.
From her marriage record in my possession I can state, that the marriage was on 10th September 1820, between Johnson Nicholson, a farmer's servant, and Mary Hoggarth, spinster, by banns with consent of parents.
Might I suggest you have a look at
http://yorkshireparishregisters.webs.com/parishregisters.htm, who have transcribed the baptisms at Kilham. It's easy to get them, they are transcribed into excel format.
Mary Nicholson wasn't buried at Kilham, but a Johnson Nicholson was, 8 December 1857, aged 60. The only Mary Nicholson buried at Kilham was one in 1819, so after the marriage of Mary to Johnson Nicholson.
Tom