The above link is a story in the Asahi Shimbun about an elderly couple who completed the Shikoku Pilgrimage recently. This is just another in a long list of heart-warming stories of people who have traveled long and hard on the path of Kukai.
I suppose that it is never too late to do it. But also, maybe the other side of the statement is don’t wait too long before you do it yourself.
Welcome to Shikoku! Koubou Daishi is waiting for you on the path!