Okay, I admit, this comic might not meet the category of being called "Really Good." But if it isn't the greatest comic ever, it is a pretty good illustration - this originally appeared accompanying an article on retirement that suggested retired people volunteer with worthy groups like Meals on Wheels. You can find that article, by Rene Vermeulen, here.
If you would like to use this comic in your publication you can find out how to get a one-time use permission for just $10 US by clicking here or by clicking on the "Buy Cartoons" tab at the top of the page. After you've made the $10 payment you can download a high resolution image of this comic here (right click the image to download it).