I celebrated my birthday.
I am now solidly, right smack in my mid-40s. I can't claim "early-40s" or "just past my 30s" any more. Without a doubt, I am middle-aged.
I will admit that I've been feeling a bit... well... old.
At least I've managed to dodge that whole Midlife Crisis bit. In my 40s, I've found fresh interests and excitement while staying happily married and avoiding any crazy stunts or purchases of convertible automobiles.
I'm feeling kind of old, but I like the life I've led so far.