Lockhart, a longtime NASA supporter, received the Exceptional Public Achievement Medal in 2013 for her advocacy.
She was married twice and has two daughters, including actress Anne Lockhart.
A cherished tradition in her family is watching A Christmas Carol—her film debut alongside her actor parents.
Reflecting in 2015, she said, “I used to think 90 was old, but I feel 55.” Her passion and energy continue to inspire generations.