I'm 64 and I just started on it recently. I'm shooting 80 pounds and need a little push in my workouts to maintain strength and muscle. It definetely works,and I feel it also has helped me with my shoulder pain I had from bicep long and short tendon. I feel as though I have gotten more limber,stronger, and flexible.
It does take a concerted water intake effort, and it seems for me anyway, the more water intake, the more pump I maintain lifting weights. I intend to use it until the end of the year and wean myself off it. I am dead set against the Doctor advised "TRT" nonsense as I feel it is simply taking steroids,legally. When you age, you need any boost you can take and creatine used with amino acids and whey proteins really helps me I feel.
Now for those of you backpacking into the woods for 7 days and limited on water intake ? I encourage you to wean yourself off atleast for a month afterwards before embarking on those type of hunts. Your body needs a large amount of water,and when not supplied, cramps come from all over,including your chest/heart. So I see it as being a supplement that calls for additional care, and when in the back country, you don't have those sort of ways to care for yourself 24/7.