If any such former owner, or person claiming under him, during said period of 20 years, or any portion thereof, is a minor, mentally ill, imprisoned or absent from the United States he may, if otherwise entitled, bring such action at any time within 10 years after such disability is removed, notwithstanding said period of 20 years has expired, and if such person dies during the continuance of the disability, and no determination or judgment has been had on his title or right of action, such action may be brought by his heirs, or other person claiming under him, at any time within 10 years after his death, notwithstanding the 20 years have elapsed.