I'm 38 and have noticed vertical, crepiness, fine lines on my neck, particularly when flexing. (Photo)

While non-invasive treatments may improve the appearance for some people, many repeated treatments may be required. Nor do the results outlive those from a surgical procedure.  It's best to begin by consulting with a surgeon in-person.  She or he will evaluate both your anatomical features and aesthetic goals to determine which procedure best suits your individual needs. In some cases your plastic surgeon may give you more than one option to choose from. A neck lift is a general term used for rejuvenating the neckline to create a more youthful attractive appearance. There are various surgical techniques for a neck lift which will be discussed during your consultation. Also, additional procedures may be suggested to complement the neck lift for optimal results.
During the examination the chin will be evaluated along with the neck and jawline.  A weak #chin means there is not adequate chin support for the skin along the neck line. In younger individuals a chin #implant alone is usually all that is needed to improve the appearance of the neck. Subsequently, it will also improve the overall balance of the face and can create the illusion of a smaller nose. As a stand-alone procedure, chin augmentation can be performed in the office under local anesthesia. For individuals with signs of aging in the neck, a chin implant added to one of the recommended procedures above, will provide optimal results.
The contributing factors to the #cost of a #neck lift include the surgeon’s fee, facility fee, medication cost and the anesthesia fee. Estimated fees may also be found here on Real Self, and the American Society of Aesthetic Plastic Surgery website, Surgery.org, or PlasticSurgery.org.  However, many #payments plans exist for cosmetic procedures. Ask your surgeon's office about finance programs and lenders they may recommend as well as personal loans available through financial institutions. It is important to choose a board-certified plastic surgeon who specializes in #neck lift procedures is important to ensure you are receiving the best advice, care, and surgical experience possible.

It appears that your neck is still quite youthful and the lines you're concerned about appear to be mild. Botox can relax the platysma bands and a laser skin tightening technology may help firm up loose skin to some extent.