Recently, a colleague told me about an experience she had with her father and father-in-law. Both were widowed. Both were of an advanced age. Both were beginning to experience trouble getting around. When presented with the proposition that they could benefit from using a wheelchair at times, one was all for it, the other was completely opposed. This story illustrates an important aspect of the aging process that doesn’t always get a lot of attention, but which can be the most important variable in anticipating how challenging the aging process will be.