Jeff Bezos mother’s cause of death and net worth is here. Who is Jacklyn Gise Bezos, who died at the age of 78? Jacklyn Gise Bezos, mother of Amazon founder Jeff Bezos, has died at age 78 after a battle with Lewy body dementia. Surrounded by family at her Miami home, she was remembered for her dedication to education, philanthropy, and her role in supporting her son’s early business success.