Dr Shane and Israr have both given comprehensive answers to your question. I personally address my patients' skin quality and volume loss/excess first before commencing threadlift; for the best results possible.
Simply put, a combination of non/ minimally invasive aesthetic procedures including threadlift, can achieve the result of you looking years younger. However, threadlift is not able to remove excess skin laxity with aging, which requires surgical intervention.
Hope this helps!
Cheers,
Dr David Deng