Hi Shirely
This fits
There is no Elizabeth Frost for Leic's/Staffs/Warwickshire but about 5 in Derbyshire birth year 1771 -1841 census
Could be early marriage large gaps spread of sibling or many and though young it still fits the normal 20 ish wedding age rather than a marriage 1805ish in later life (34)years at marriage .! This below is aged 16 1787 marriage thus would need a fathers pemission and maybe licence bond marriage with ages on and fathers signiture.
John Frost married Elizabeth Marsh
in Bolsover Derbyshire 7th June 1787
Elizabeth Marsh Bapt Smalley Derbyshire 6th may 1771 fits as census age 81 in 1851c
Father Thomas Mother Dorothy
MY mother came from Bolsover and her Granddad from Warwickshire, Workers came up from there to find work in the mines of Derbyshire. Thus either John or Elizabeth families may have originated from Nunheaton area.
STRONG POSS

Dobby