I am your age, in fact I will turn 68 in a month. I can quilt a queen and larger on my 9" throat machines. I don't exercise, I know I should. I do physical work every chance I get. I use a high loft poly batting, warmth without the weight. I hope I will always be able to quilt my quilts. I take pride in being able to say I made it myself. Like someone else said, you need a big table behind the quilt, to the left side and right next to your left hip and leg. Let the tables hold the quilt for you.