I have a number of bows, Robertsons, Widows, Cascade, and a few others with two sets of limbs for the very reason you have in mind. Ironically, I always seem to just shoot them with the one set of hunting weight limbs, all in 60 or 61# at 28*. But at some point, the other sets which are between 53 and 57# will be the ones that will get the nod. At 73 the 60 and 61 are beginning to feel like 60 and 61. I do have one bow that I have hd for 30 years. It,too, has two sets, 60 and 74#. That one I put away so I don't hurt myself.