Welcome to getting older. Cold, any allergy, age, getting heavier.
As we age everything starts to leak, including vessels. This causes us to swell and gravity being what it is, it always goes from higher to lower. If you sleep sitting up or are still for a long time, your feet or lower legs will slightly even with very healthy people. The muscle tone decreases and did I mention everything leaks a little? Vessels as well as the lymphatic system leak= swelling.