Hi tbr701,
It’s always a good idea to rotate a one sided mattress or alternate between flipping and rotating a two sided mattress on a regular basis to help even out any softening or wear in a mattress over time and flipping and rotating individual layers in a component mattress (particularly the upper layers) can also make some difference as well. You can see the rotating and/or flipping schedule I would suggest in post #2 here.
Phoenix