While there’s no sure way to insure that your marriage will last for a lifetime, a few tips may help you extend the life of your marriage. They include: 1. Kissing your spouse several times a day. 2. Say I Love You to your spouse as often as you are able. 3. Affirm something your spouse said or did and say something nice in return. 4. Be kind to your spouse every day. 5. Do something caring and romantic for your spouse as often as you are able.