Honestly, the only disadvantage is that you can start to feel your body breaking down.
Everything else just gets better. You're wiser, smarter, more confident, less bothered, and you have fewer fucks to give.
And honestly, I look hotter now than I did in my twenties or thirties.
If only the world didn't keep on getting worse every year.
Take a walk. Even if it's just on a treadmill. Even if it's just up and down the stairs a few times. There are empirical studies on this; the physical act of walking energizes your brain. Doesn't have to be outside, doesn't have to be going anywhere. Just walk. Five to ten minutes, put a podcast on or something. Do that every hour or two.