Maybe it would be more useful to specifically ask if there is anyone currently in their 70's still reading this thread or if anyone in their 70's has posted results or anyone with a family member in their 70's taking NR (or NMN) who might give an update.
I'll speak up for the old folks being here. I'm not quite in my 70s yet, but a few months away. I've been on NR of some dose or other since Aug 2016. I'm not going to say it hasn't helped, but if you want me to put my finger on a specific 'wow' moment I realized NR was doing something wonderful...well...I can't. Nevertheless, for some reason I do feel it helps my overall health - and why I still take 250mg each AM.
Why? IMHO one simple thing is a requirement for better health & aging using NR or any NAD+ precursor ... and that is cardiovascular exercise and lots of it. My opinion is if your body doesn't use much energy (couch potato), it will pretty much not use molecules presented to it. To keep heart, lungs, blood, muscles, etc. going well into 60s, 70, 80s, and beyond requires work, physical work, that uses the body as you did when you were younger. I believe NAD+ precursors offer that help. Don't want to do the work? Save your $$ - Precursors are more or less a waste.
So Nate, I wish there was a "60s & up" thread for NR and another for NMN, and another for CD38, etc. ...Or maybe one NAD+ thread ONLY for over 60. I simply don't believe NAD+ precursors do much for healthy young people, and so their experiences are suspect as to what they say they get (sorry young people )
One the other hand - I would say I've experienced a 'Wow - that's something!" moment and more with NMN. Whatever is happening with NMN, it seems to be doing something especially good for my body - losing weight, strong muscles, lower heart rate with exceptional energy for exercise. That's something to get excited about, but them maybe what was required was the NR + NMN combo? Whatever, to hear from other 60s, 70s, 80s age people specifically would be great.