An engineer? and you are doing this. That is great most engineers like to have everything proven. My ex-husband was a physicist and my son an engineer, they have a hard time with this. But like my son says I can't argue with your results.
Tell your dad I started when I was 67 and I am 70.
You might consider buying Andreas book Timeless Secrets etc. 500 pages with info.
BTW I have have my mouthful with silverware and gold and all my aches and pains are gone.