1800 Christopher Greenewalt, age 16-26 or 45+, lived in Manchester Twp, York County, Pennsylvania. Next door was Frederick Greenewalt, age 26-45. This is a possible fit to this Christopher Greenawalt, who would have been age 25, with father Abraham age 45+.
1815 Christopher was named as a son in the will of Abraham Greenawalt of Manor Twp, Lancaster County, Pennsylvania, dated October 6, 1808. The children may have been named in birth order. [1] [Photocopy, Extract of Abraham Greenawalt's will.]
... and I order that all my children shall have equal share out of my estate to wit Abraham Greenawald, Jacob Greenawald, Elizabeth the wife of George Albert, Christopher Greenawald, Susanna the wife of Henry Shoff, Christian Greenawald, Michael Greenawald, John Greenawald, Henry Greenawald, and Peter Greenawald each of them an equal share.
[1] Pennsylvania Probate Records, 1683-1994, Lancaster, Will L-337, [FamilySearchImage].