Hello @BobT768. At the bottom of your email, there is a link that says Update Profile. When your contacts click on this link, they are given the ability to update their contact information. I do see that your form does include a space to insert/update their mailing address so I think this would be the best option for you. You may want to create an email and in it, ask your contacts to click the Update Profile link so they can make sure their information is up to date.
Check out this FAQ as to how to create an Update Profile request email: