David Lewis McDonald - Parents for David L McDonald

Parents Hugh McDonald and Rebecca Erwin need better sources. Are there any deed or other records showing the Hugh McDonald was in GA at the time of David's birth? Rebecca would have been 46 at David's birth, that's the youngest she could have been. Her find-a-grave profile gives her birth date as 1720, which would have made her at 51. I'm curious whether there's another source for either date.