Some genetic makeups are unique. You could have just hit the genetic lottery.

Really? I've never met someone with healing factor...being a doctor they never need it. But the correlation with memory and healing factors degrading is interesting.

I'd think the neurons responsible for forming memories would remain intact and you'd remember everything.

Sorry, I get a little excited about mutation and medicine. I have to tell myself to stop sometimes. I'm sure you have better things to do.