Christina Adaline Climer-Gates recollection

I have a typed page that was given to my grandmother by a descendant of Charles Horatio Gates (youngest son of Wm Filmore and Christina Gates). It was dictated to C.H. Gates on June 1st 1918 by Christina when she was 85 years old.

This is what it says exactly (misspelling, typos, incorrect info all intact):

William Gates was born and reared in North Carolina and emigrated to Tennessee in 1755. He had four sons; John, Valentine, Andrew and William; and four daughters: Lucenda, Betty, Polly and ?

He was a veteran of the Revolutionary War. His youngest son, William, was born and reared in Smith County, Tennessee and was a veteran of the Mexican and Civil Wars.

He married Christina Adaline Clymer from which marriage the following children were born: William, John, James and Charles, Kate, Connie and Fannie.

At the time this was dictated, the Great World War was raging and my mother, Mrs. C. A. Gates, has 12 grandsons overseas. Paul Killingsworth, Fannie's son, was killed in action on the Argone, October 1918.

There are many things about this dictation that I question:

1. I'm not sure about the date she says Wm emigrated to Tennessee. Most people emigrated after the Revolutionary War to Tennessee because they received land grants. But 1755 was before the war. Not impossible that he moved there before the war, but unlikely.

2. Also the way she says he was "born and reared...and emigrated" makes it seem like he was old enough to do it on his own (not with his parents). Assuming he was at least 10 years old to have been able to do that and his youngest son* was born in 1825, he would have been 80 when that son was born. Again not impossible, but unlikely. *She doesn't mention if William was the youngest child or just the youngest son.

3. It's interesting to me that she doesn't list Catherine as one of her husband's sisters. I have seen letters between her husband and family back in Tennessee referring to Catherine's husband, William (whom he called Bill) so she was surely aware of Catherine. Maybe at 85, it'd been so long since they talked that she forgot her name?

4. I also wonder if Charles (to whom the letter was being dictated) added the last sentence later.  Because it says at the top that Christina dictated it to him on 1st of June 1918, but that Paul Killingsworth was killed in October 1918.

Updated 15 Sep 2015 to add a scan of the page: