When I was a kid I used to ponder the nature of existence on the day before my birthday. "I'm six," I'd think. "I've been six practically for ever. I know what it's like to be six. And today is the very last day I'll ever be six. I'll never be six again." This would always be followed be a feeling of let-down on the following day, as I'd walk around thinking "I don't feel seven. I mean, I know I am seven. But it doesn't feel any different at all. It feels just like six. I wonder if I'll always feel like this? What if I feel like this when I'm eight?"
I woke up this morning and thought, "this is my last day of being forty-three. I'll never be forty-three again." But I bet I don't feel forty-four tomorrow. I bet I still feel twelve.