HAve a cell phone just for this use. Have them text in the bets. That way all the action would be tagged with the date and time. Just tell them to use that days newspaper for the lines. If they are square as you put it it won't make a difference.
I love it when people are called squares that cracks me up. We are all squares for the most part. Since about 10% of gamblers can make real money.
Good idea but old guys don't text...