We moved my parents from a two storey to a one storey about fifteen years ago and damn if it wasn't one of the best decisions we (the extended family) ever made. Dad got a mobility disorder not three years later and we went from twenty stair steps in the house to three. The front porch, the back porch, and the step into the garage. We even got a wheelchair ramp installed, which was great for my SIL (she uses one). The timing was fortuitous.