This is my last Sunday as a 39-year-old. Every day this week will be the last of its day that will exist for me as a 39-year-old. On one hand, I say, "So? It's just a number. Turning 40 is no big deal. I can't help it, so why even think about it?" And on the other hand, I feel like it is a big deal. I feel a little nostalgic or sad. Something I can't quite identify. But whatever it is, the FORTY-ness is at the core. Should I admit that it's a big deal? And IS it?