My mom has been dead 42 years. I'm adjusted to it, how can you not? 
But a few minutes ago, I had a conversation, details don't matter, wasn't anything deep or emotional, was light and funny.

But, I picked up the phone, to call mom. It's not upsetting really, just strange after all these years.

DAE ever experience this? I know the first couple years after she died, it's kinda normal. But I'm 60....