There are a few options: Ultherapy to the lower face can help lift & tighten the area. Dermal fillers such as Juvederm can filler the area below disguising the fold. I would recommend a combination of the two for the most natural result. Be sure to schedule a consultation with your nearest...
Many body features are the result of our gene pool. I doubt exercise alone will do much for your NLF area. I use HA fillers in individuals in their mid 20's almost every day. If your NLF's bother you I would recommend that you go to an expert injector for assistance. Best Wishes, Maurice Vick MD
These can be improved with a combination approach of fillers, lasers, microneedling/prp. I recommend getting a formal evaluation with a cosmetic dermatologist. Best, Dr. Emer