I'm also in my 30s now, and had been concerned about potential aging effects after having surgery. I lost weight at the speed of a snail, and I think that helped give my skin more time to adjust. My doctor told me to stop showering as much because I was drying out my skin with daily, and sometimes twice daily showers if I'd had a sweaty workout. Her suggestion was to just clean under the arms, the feet - the smelly bits - daily but not fully immerse in a shower every day. I use dry shampoo to keep my hair fresh. I typically shower three, sometimes four times a week, and use an in-shower moisturizer, then as soon as I step out apply a body oil (Trader Joe's has one that smells and feels lovely), and after it has had time to be absorbed, apply body lotion.
My face became softer and far less irritated and dry when I switched to Korean skincare, which is gentler. There's a "beauty guru" named Charlotte Cho has a popular site with product recommendations. I usually buy the products from Amazon or a local Japanese market that carries a lot of Asian products. I do the "double cleanse" method of a creamy emollient face wash to remove makeup, followed by a foaming green tea face wash that removes residue. Then I use Dr. Thayer's Witch Hazel, which isn't Korean, but is beloved. I actually found out about it from a woman who is also in her 30s and had the VSG, who goes by Fit Miss Bliss. She said it made her skin "fluffy", in a good way. Then I use Korean milk lotion and finally a moisturizer. I may try to add in Retin-A, sparingly, as a preventative. Before I started the Korean beauty products, I had fine lines and wrinkles on my forehead, and they've totally disappeared now, unless I'm super dehydrated. It's definitely helped with aging. I am a professor and getting confused as a student now, and getting card far more often, than I did prior to having the VSG in 2015. I definitely recommend giving it a try.