I've always looked for the lines at the grocery store that has an elderly single person in them and unload their groceries from the cart to the counter or if I see them struggling to get them in the car, I help them out. I've taught my kids (now in their 20's) to do that also. Of course, my son has a shaven head and tat's all over and it kind of scares some folks at first...LOL
Hopefully when I'm not able to do these things myself anymore, somebody else's kids will help me out!