Is NAD+ the “fountain of youth”?

Aging is definitely not for me….so I’m using NAD+ as my new found “fountain of youth.”. I don’t like aging any more than the next guy and recently I’ve been noticing little reminders everywhere: not keeping up with the 20 year olds playing basketball at the gym, the soreness after a workout that lasts 3-4 days now, the fatigue that sets in earlier and earlier in the day and that irritable mood that comes more often now and colors everything in my life pessimistic.