Thank you for your question. Seen a photo would have been very helpful. Have you ever had any treatments done to that area? How loose is it? Did you experience significant weight loss causing the skin to sag?We lose 2% of collagen every year as part of the aging process, which starts around 25 years old.The goal of every single laser procedure is to enable body to produce collagen. The difference is how each laser does it. Then, the duration of the result is dependent on the "half life" of collagen. After 50, after hormonal changes like menopause, your ability to make collagen is not the same as well as the collagen you make is not as strong or robust and doesn't last more than 1 year.The collagen production is affected by aging, hormones, skin quality, medications, lifestyle, etc.There is no single treatment that will work best. Combination is the key. at 67, you likely have some fat loss in the arm area in addition to collagen and elasticity loss.I recommend you seek a consult for surgical vs non surgical options to remove saggy skin as a starting point.Good luckBest,Dr.Anna Avaliani, NYC