First, of course, is running. Running 10-15 miles a week the last part of 2007 made me healthier, happier, have more energy, look better, and feel more vibrant and young.
Second, keeping up with a toddler at the ripe old age of 37 has been incredibly fun and joyful. That'll keep you young. As I looked at her the other day sitting in a high chair, wearing a bib, eating a cracker and drinking from a sippy cup, I found myself thinking, "Wow, two years ago I thought I was done with sippies, bibs, and the like. But I'm so glad I wasn't." My little "bonus" baby has been such a blessing.