Is it normal for only the skin on the inner arms to sag like this as you get older?

It's not that I've gained weight, but when I wear short sleeves, I can see just the skin underneath dangling loosely, and it pisses me off every time I look in the mirror. No matter how hard I pull my arms at the gym, it just feels like flabby skin is sitting on top of my muscles. It feels like this is an area where gaining weight through exercise is absolutely impossible.

I'm passing on liposuction because I'm scared it makes my skin sag more, so I'm definitely going to go all out with a body lifting laser. Which one is the most immediate and effective?

I heard that the body is thicker than the face, so you have to hit a ton of shots to see results, and I don't want to waste my money. I can just endure the bruising or pain, so I just want it to be worth the price.

For those of you who have had body treatments like InMode or Ulthera on your arms, is it really effective?