This week, I will celebrate my birthday again. Most years, I don't find my birthday to be an incredibly big deal. As far as I'm concerned, my last major milestone birthday was 30. Ever since then, I have sometimes even found myself stumbling to even remember my own age. "I think I turn 34 this year. Wait! No! How can I be 36 already?" Thirty nine feels a little bit different. I'm not going to say old. I don't really feel old. Most days. But 39 feels like something more significant. It's the eve of 40. On my last major birthday (yes, we're still talking about 30), I had just become a mother for the first time. I was engaging in what I felt was truly "a career" (rather than "a job"), and I still felt like I had barely left college. What a difference nine years makes in so many ways. So to celebrate this personal milestone, I wanted to share some wisdom gleaned from 39 laps around the sun. Many of these thoughts aren'