Citations:have one's mind about one

Noun: "to be composed or lucid (especially of an elderly or mentally ill person)"

 * 1833 — John Banim, The Smuggler: A Tale, Volume 3, page 40
 * “Mr. Linnock,” interrupted Martha, “hollaring out, or swounding, be not my way, when to have one's mind about one would be a better way
 * 1845 — James A. Sharp, On the Establishment of Navigation Institutions at the Outposts: a Letter to the Right Hon. The Viscount Sandon, M.P., page 44
 * He will be, moreover, the coolest man, and the fullest of resources, in time of difficulty, because he has his mind about him ;
 * 2004 — Mark Wildes, Order of Coincidence, page 84
 * “She's good. I know she's good when she can still send Jason a Halloween card. You know, she still has her mind about her and all. "
 * 2008 — Madeline Hunter, Secrets of Surrender, page 223
 * “It is not only saying good-bye. I need to see if he still has his mind about him. I would like to ask one final favor, for the miners.”