Okla. Stat. tit. 10, § 10-7503-1.1: Eligibility to adopt

The following persons are eligible to adopt a child:

1. A husband and wife jointly if both spouses are at least

twenty-one (21) years of age;

2. Either the husband or wife if the other spouse is a parent

or a relative of the child;

3. An unmarried person who is at least twenty-one (21) years of

age; or

4. A married person at least twenty-one (21) years of age who

is legally separated from the other spouse.