There are three tissue variables that contributes to the contour of the male chest. These are skin laxity, subcutaneous, fat and excessive glandular breast tissue or (true gynecomastia.) With age, we lose skin elasticities, and this creates skin laxity due to gravity. This is very common in men your age. loose skin creates contour. This the potential appearance extra fat or excess fullness. To differentiate between the three variables, take one hand at a time and stretch your arm like you’re scratching your upper back. Put your hand behind your head, putting the pectoralis and muscle under full tension. Do this with one arm at a time while looking in the mirror or have someone else take a picture. With the pectoralis muscle and skin under tension, you can clearly see the soft tissue contour of both the fat and breast tissue layer. My best guess is you’ll notice that you don’t have any gynecomastia and the fat layer is exactly the same on both sides. You simply have developed a little more skin laxity on one side than the other. This is inevitable due to age, and there is no good justified treatment. The only treatment that works is direct skin excision, which leaves, invisible scars and I don’t think it’s justified in your case. You should be proud of the shape you’re in and all the work you’ve put into physical fitness over the years. You look far better than the great majority of men, half your age. Age takes a hit on the skin on skin laxaty often looks like excess fat and can contribute to undesirable contour. I do not recommend considering surgical intervention for this. If you do it, it needs to be directed towards skin laxity and generally skin surgery leaves visible scars. If you don’t mind having scars, then surgery could potentially be an option. Liposuction or excision of breast tissue it is not going to give you quality results. I am making certain assumptions and recognize that as quality assessment requires more than a single pictures viewed on an iPhone. Best, Mats Hagstrom, MD