I recommend a combination of Pelleve and Nectifirm cream to address skin laxity in the neck region. You will need 4-6 Pelleve treatments and you will need to use Nectifirm twice a day for at least 2 months.
ThermiRf Treatments To Tighten Neck And Jowls
At 26 years old a facelift is normally not recommended. At your age a non-invasive or minimally-invasive approach would be the most appropriate. Radio frequency treatments to the surface of the skin with ThermiSmooth can help melt away fat to smooth the areas in question. If additional tightening is needed, ThermiTight applies the same "science of heat" but under the skin to really target areas that have lost elasticity or that have developed pockets of fat.
Loose neck skin in a 26-yr old.
You may want to look into Exilis which is made by BTL corporation and works well to tighten skin in this area, in particular if your weight is stable and your being quite young. It is a painless procedure and takes 4-6 weekly treatments for ideal results. It should be available at a board-certified dermatologist in many areas around the United States.