For the first time in years, mine actually arrived at a "normal" time (approx 28 days between) instead of whenever it wanted.

Except for this month, because I really blew it on the carbs a couple days beforehand, I've also been pain-free.

This is wonderful. I also notice that the amount is manageable, rather than running down my legs (and I'm sorry to offend anyone who doesn't care for such graphics).

On another note, 43 shouldn't be too old, but each person is different in the way their metabolism and body changes occur.

So I guess the short answer is - when I eat correctly, my body responds by behaving correctly; when I stray, it reminds me.