According to my sources -- Shenandoah County Marriage Bond and 1850 US Census -- Lucy Cave was born about 1790.
1850 US Census lists her as 60 years old and the head of household and living in Rappahannock Co., VA with Elizabeth-25 and James-24.
According to Shenandoah, Virginia Marriage Bond dated 2 Jan 1815, Enoch Jenkins married Lucy Cave daughter of John with the bondsman listed as Thomas Cave.
Siblings of Lucy: Thomas Cave 1777 – 1860, Joseph Cave 1777 –, Polly Cave 1785 – , Jonas Cave 1786 – 1879, Benjamin Cave 1787, Nancy Cave 1789 – 1875, William Cave 1790 – 1886, John Cave 1790 – 1860, Ruben Cave 1794 – 1864, Sally Cave 1794 – , Reuben Cave 1805 – 1864, Noah Cave 1844 – 1931