Is there a most effective way to manage a double chin that appears with age?

Lately, every time I look in the mirror, I'm worried about my double chin. I'm not the type to be overweight, but as I get older and the weather gets colder, my activity level has decreased, and I can clearly see sagging under my chin. Plus, I work overtime a lot these days, so I can't use my neck and jaw muscles as well, which I think is also contributing to the problem. When I lost weight, my jawline was still a bit more defined, but recently, due to stress and an irregular schedule, it's starting to feel like it's sagging again.

I searched and found many methods that claim to help manage double chins, and some even suggested treatments could improve them. However, I'm not sure if these treatments are truly effective. I'm particularly curious if I, like others with irregular lifestyles and aging skin, can experience noticeable results.