When it is damp outside, older folks often feel -.

Cold

Explanation:

Older folks are more prone to feeling cold than younger ones so a change in temperature outside such as it becoming damp, will lead to them feeling cold.

Older folks are this way due to the fact that humans experience lower metabolism as they grow older as well as skin thinning. Lower metabolism means that they will be producing a relatively lower amount of heat as a by-product of aerobic respiration in order to maintain their internal temperature.

Skin thinning will also reduce the layer of skin available to insulate the skin from outside temperatures.