The Shell Seekers (1989)

Given an opportunity to trade her most cherished possession for comfort and security, Penelope Keeling (Dame Angela Lansbury) must take a good look at her future. With three grown children and a lifetime of memories, she realizes that something is missing: the simple joy she knew as a child playing on the beach. So she embarks on an incredible journey--50 years into her past--to discover the secret to happiness for her friends, her family...and herself.