The executor named in any last will and testament, whether made in this state or out of it and admitted to probate here on an authenticated copy or on the original, shall be entitled to letters testamentary thereon if not legally disqualified. A person shall not be capable of being executor who, at the time when letters testamentary ought to be granted, is under the age of eighteen years, of unsound mind, or convicted of a felony.
Miss. Code § 91-7-35