Okla. Stat. tit. 60, § 31
The absolute power of alienation shall not be suspended, by any limitation or condition whatever, for a longer period than during the continuance of the lives of persons in being at the creation of the limitation or condition plus twenty-one (21) years, except as provided in Section 34 of Title 60 of the Oklahoma Statutes.
R.L. 1910, § 6605; Amended by Laws 1977, SB 123, c. 5, § 1.