As you age you will need to be more diligent and aware of any changes in your skin. If you notice that your skin gets red more than usual you should look at changing your cushion or mattress for one that provides more pressure relief.
It is also important that you have a good balanced diet and are drinking enough water. If you are unsure about your diet, talk to a dietitian. Managing your weight is also imperative and it is important to remember that smoking has a significant effect on your skin.