I agree... never too old. My first Camino.... SOLO..... from SJPDP to Compostela was in 2015 at the age of 77 and my second was 3 years later in 2018 to celebrate my 80th birthday... again the full 500 miles SOLO; and then I also went to the Finisterre and Muxia. I took my time and 50 days to do these walks. Many times alone as I walked my own pace; I stayed in Hostels along the way. Many pilgrims would slow down and walk with me a stretch just to hear my story. I made many friends and I'm still in touch with several of them. And several walked more than a day with me.
We'd planned a family trip in 2021 for several of our group to walk the Portugal route and others to drive the car and meet us every night, enjoying touring during the day. But, Covid happened and it was cancelled. Yes... I definitely want to walk another time. In preparation, I walk several miles a day, walk up a steep hill at least once a week and , on Saturday mornings I do a ten mile walk with my two daughters! Oh yes.... we live in a condo on the third floor and I only take the elevator when I've been shopping! Otherwise I walk two flights of stairs several times a day. Hopefully next year II will do my third walk at the age of 84. But it depends on Covid conditions. Buen Camino