I keep Forgetting

I'm glad I was finally able to buy Joey's aaa rechargeable batteries for his wireless headphone.  He kept on reminding me to buy them but with so many things in my mind, I kept forgetting.  I've been out a lot of times this week and I was at the mall several times but it was only yesterday that I got his batteries.  If he didn't text me, I would have forgotten them again.  Is it a sign of getting old?  I hope not. :)