Do not go gently...
I have discovered, due to close contact with an aging population, the definitive "it's time for plastic surgery" test. All that is needed is one face/neck with sagging skin and a blow dryer. Adjust the settings on the blow dryer to cool and high. Aim the nozzle toward nose from the side at the face and activate the switch. If there is visible billowing (yes, that's correct BILLOWING) of the skin, time for a consult. Next, if you can see through your tears, aim the nozzle at one side of the front of your neck. You know what to look for and what to do if you find it.