Most people who get these "senior moments" don't get dementia. The other day I couldn't remember 'malaria' for a minute. But I've had these all my life. I couldn't remember names when I was younger. Sometimes of people I knew for years. Still that way many years later.
http://www.webmd.com/brain/news/20140310/senior-moments-dont-seem-to-lead-to-dementia-for-most
One thing that happens with aging can be a decrease in hours of sleep, which in turn, among other things, causes memory problems. I used to need 8 hours of sleep and could easily go longer. Somewhere about 5 years ago, I started sleeping 6-1/2 hours or less.
Even if I spent an 8 to 10 hour day shoveling dirt or mulch or putting on a roof or clearing a fence line or putting up drywall for the same length time and for day after day. Yes, I worked a bit slower, and I was dead tired at the end of the day. 6 hours of sleep later, I wake up without an alarm and I physically feel OK. The odd thing is that I'm usually not very tired. It makes me less sharp, no doubt.
Keep active physically and mentally and you'll be OK. Rush isn't big on physical but he reads and thinks through complex scenarios on a daily basis.
Aging is a damned weird thing. I told someone, "It doesn't sneak up on you. It's a series of muggings."
Hint: don't mess up your back! Twice!
New translation by Philip Freeman ISBN 978-0-691-16770-1
and for the ladies...from the Poetess Sappho ...a fragment from the 6th century BC:
.....my skin once soft is wrinkled now,
my hair once black has turned white.
My heart is heavy, my knees that once danced nimbly like fawns cannot carry me.
How often I lament these things --- but what can be done?
No one who i human can escape old age.
(and the FDA announced last year that Statins can cause bad decision making in some adults....sucks the cholesterol out of the brain)