Could someone please advice treatment for start of jowling/skin laxity? (Photo)

Hi, you have a few options, but facelift is the best option. The laxity/jowls will be improved a some with threads, ultherapy, etc, but to make a noticeable difference facelift is the way to go, either SMAS or deep plane. You are on a younger side for a facelift, but it will make a big difference in your case.

Since your photo shows lower jowl bulges including fullness along the jawline, I think that a cheek or upper facelift is appropriate. This would firm and lift the skin and fat in your cheeks, reducing fullness in the lower cheeks, adding it to the upper cheeks, which creates the more V-shaped look you desire. A smoother more narrow jawline results also.