Is this normal?

My mom's husband left me a voicemail this morning. He was somewhat frantic because he couldn't find my mom, didn't know where she was, and was concerned that perhaps something happened with my dad, or, uh... she just left, and, well, he'd called everyone, and, uhh...

Needless to say, when I got the message I immediately called my mom.

She was fine.

Her husband had found her hours ago. He'd forgotten that she'd told him goodbye this AM and she was at the meeting she'd told him she would be attending.

Is this going to happen to me when I get to be their age?