Well, they say 30s are the new 20s!
Puzzley, the story of your daughter is inspiring!
Another idea, Mom also has a sponsored kid in Africa, and she loves getting pictures etc. I have a sponsored kiddie in Brasil, & joked to my parents they were to be grandparents once I signed up for it! (cheaper than a real kid, and teaching me some responsibility, hopefully!) There are various programmes, in some it is encouraged to send letters & photos etc. here and forth!
Other than that, showing lots of love & courtesy to your wife (& vice versa) will be the most of inspiration to the kids to get married!