Why is my face suddenly sagging?

Why skin starts to sag
This occurs due to factors such as exposure to UV rays. ‘UV light slows down deposition of new collagen as well as activating the enzymes which break down existing collagen, causing the elasticity and volume in our skin to lessen as we age.
Sagging skin is due to two age-related reasons: loss of collagen, which gives skin its elasticity, and loss of facial fat, the absence of which causes skin to droop. … Long hours exercising outdoors equals more UV exposure, which over time breaks collagen down.