Onverser There's no in-game way to limit fps in Sims 3 in either OS. There may be an outside tool that would help, but I don't know of one and wouldn't recommend installing something just to see what happens. If you get a suggestion from a few different places though, that might be worth testing.
Having said that, damage from high fps is not a significant concern on a Mac. It IS a problem on a high-end Windows PC because the game can generate framerates in the high hundreds or thousands. But that won't happen in the Mac version, the numbers simply don't get that high. Plus macOS has more protections than Windows for this kind of thing.
In general, the only thing that damages a modern computer quickly (putting aside manufacturing defects) is excess heat, although modern hardware has layers of protections built in. Excess voltage can do damage over time, but that shouldn't happen over the normal lifespan of a computer. It can happen with defective hardware or overly-aggressive overclocks, but the latter isn't a thing in macOS and the former is what warranties are for. The other concern is of course physical damage, especially with laptops, but that doesn't have anything to do with the games you're playing.
I don't know what issues your old laptops had, but batteries at least are not built to last, and they're especially not built to be plugged in and charging all the time.
So for your Mac, I wouldn't worry about this as long as the computer can cool itself. Don't block the vents, or put your laptop on a cooling pad or fan, especially if you have a fanless model. As for the battery, set it to charge to a maximum of 75-80% and keep it plugged in while playing (for better performance). There are third-party apps to do this, and it looks like it'll be a built-in feature of macOS soon—the Tahoe beta 26.4 has this option already. Your battery won't last forever no matter what you do, but keeping it between 20 and 80% most of the time will keep it in decent shape for longer.
