Yogi Anand, D.Eng, P.E. ANAND Enterprises LLC -- Rochester Hills MI www.energyefficientbuild.com. Mar-25-2014
post by Eileen Rasmussen (https://productforums.google.com/forum/#!mydiscussions/docs/lOLvSROOiNU)
Sheets formula for subject age at time of testing
So I've Googled this pretty well and come across a few similar questions, but none of the suggested formulas have been working.