How long do tires normally last?

Most tires last between 3 to 5 years, regardless of mileage - and that's the most important part: after 3 years, even if the tire looks good, the rubber ages and becomes more brittle. In your case with a 2019 Gol, if the originals are still on there, that's about 5, 6 years now, and honestly it's time to think about replacing them, especially if you're going to be driving on the highway frequently. Visual wear is deceiving - go into any shop and ask the mechanic to check the tread depth; when it reaches 1.6 mm it's mandatory to replace them, but I don't recommend letting it get there, it's too dangerous.

The lifespan of a tire is something that depends on two factors that are always at odds with each other: mileage and age. The people above might be right that rubber deteriorates over time, but in practice what usually happens first is physical wear. In your case, with 200 km a month on the highway and the rest in the city, you're doing maybe 4000-5000 km monthly? That means your 2019 tire is already 6-7 years old, and depending on tread depth, it might actually be approaching the safe limit.

The truth is it's not always easy to tell just by looking. A trick that works well is to take a coin (works with a Euro) and stick the head side into the tire's groove. If you can see the coin clearly, the depth is too shallow. The legal minimum is 1.6 millimeters, but most mechanics say that at 3 millimeters you should already be thinking about replacing them, especially if you drive in the rain. Your Gol should still have quite a bit of tread, but at 5-6 years old the rubber does get actually harder and less grippy, regardless of how it looks. If they're still rolling fine, check how much wear they have and compare it to new ones - if the difference is small, maybe it's worth letting them go a bit longer. Now, if they're over 5-7 years old, I'd suggest you plan for a replacement soon.