He is 64. He swims and does lots of inner core exercise. Happy as charm and is having no problems with the ladies now.

You should see a urologist if you haven't already.  Avoid online come-ons, many of them are rip0ffs.  Check the over 60 DB if you haven't already.  At 64 you should have many good years left if you do it right.

I'm not quite in your age range, but I was having some difficulty a few years back. After hearing about the benefits of green, leafy vegetables, I realized my diet was crap. The only time I ate anything green was when somebody else cooked for me.  

Changing your diet won't help when you have a sudden desire to see a lady, but it'll help you build up for the future. Rotate some kale, collards, and spinach into your diet. And eat as many sunflower seeds as you can stand (preferably unsalted). Both made a big difference for me. Turned the clock back about 15 years. Plus they're good for you anyway, part of the G-BOMBS micro-nutrient package. (Greens, berries, onions, mushrooms, beans, seeds)

I also mixed in some vitamin E supplements, but be wary of them. Recent studies have linked them to prostate cancer. Not dietary vitamin E, just the supplements. I dropped the E and it didn't make that big a difference.

Haven't had to try the blue pills yet, to actually answer your question.

At 63 I use it and it's like I'm reborn. I take it 45 minutes before a date and I get hard and last the hour. Delightful.

Yep.  Works great.  Get the 100mg pills.  They are the same price per pill as the 50mg ones.  Just get the 100s and cut them in half.