How can I tighten up the skin around my jawline? (Photo)

Thanks for sharing with the community.  Unfortunately some individuals are genetically predisposed to age faster in the lower face than others.  In addition, having lost significant weight only accelerated the issue and drooping.  Assuming your physical exam matches what we see in your photo, I would expect that you would qualify for a lower facelift and necklift. Mind you, there is not definitive age to have a lift...some have it in their 30's, others in their 80's!  Most important is that your procedure is preformed technically well so that in 10+ years you can do it again if you wish.  I would also suggest finding a PS that offers this procedure under local anesthesia (as we do here in our Center).  Performing a lift under local is safer (and less expensive) than having it done under general anesthesia.

Thank you for your question and pictures.  Unfortunately, when people experience a large amount of weight loss their skin will lose elasticity due to being stretched.  This can cause patients to have more of an 'ageing' appearance.  You would be a good candidate for a lower facelift and necklift.  This would target the SMAS muscle and remove the lose skin making the jawline and neckline smooth.  This would give a youthful appearance.  All The Best 

Congratulations on the weight loss and getting healthier and being medically optimized! 
Usually when there is excess skin from weight loss, removing that skin is the best option.There are various combinations from a mini facelift, mid facelift, and neck lift that can address different areas. There are never any guarantees of course with any procedure whether it is surgical or nonsurgical in nature.Surgery is not for everyone. In today's day and age, there are many nonsurgical options to consider although surgery usually gets the most improvement specifically of the jowls.I would recommend that you see a board-certified plastic surgeon in your area that is a member of both ASPS & ASAPS and performs a lot of facelifts but also offers all the nonsurgical options such as injectables and laser treatments. Go over your concerns with them and make sure above all, you walk out of there with several options and an idea of the pros and cons to each of them as well as realistic expectations. I hope this helps and wish you all the best in your surgery and event. If it does, please take a moment to up vote this answer on the “respond” button on the top right.