Guysmom, I'm an old timey gray haired lady too. I will admit that I occasionally get some help from Miss Clairol LOL.
Technology wise I've made major strides since I started mystery shopping back in 1997. Back then I had to find constructive ways to take notes like you mentioned and I printed the full, blank shop reports and guidelines incessantly.
Today I print very little, only the first page of each shop that gives me the details of the locations name, it's address, the fees etc. I do that so I will have something to staple the proof of visit or receipt to before I file it. I use the RouteXL app on my phone to plan my route for the day, saving gas and driving time. But I think the biggest improvement is that now I can go out with seven or eight jobs (sometimes more) on my clipboard for the day and with the survey open on my phone I input the information as I go, saving it every 10 to 15 minutes. By the time I get back to the car I usually only have the narrative left to write if the shop requires one and I submit it before I go on to the next shop.
By the time I get home all of my reports are already submitted and I don't have to worry about trying to remember things from earlier in the day or refer to notes that I took along my route. The process works for me. At the end of the day all I have to do is staple my receipts or POV to that first page of the report that I printed and then log it as being complete to await payment.