How do people cut their lawns without using lawn mowers in developed countries?

Manual grass clipper.

Goats.

They let the gardener worry about it.~

And, I know people with small yards who ‘mow’ with a weed wacker.

Anyone can find an old fashioned push mower, you can buy then new for little.
They work great on smaller level yards. Otherwise yep, you could hand clip it with shears, put a flock of geese in the yard ( our 5 guys are walking weed eaters and fertilizers. haha ) or, use a weed eater. Goats don’t eat grass, sheep do. Goats are browsers, they prefer shrubs, bushes and trees to grass. Sheep are very effective.

Rotary push mower.

Goats or sheep would work. Plus you get milk or offspring to consume. (Easy I’m kidding)

I use goats. They eat the grass just fine if it’s all that’s in the pasture, though they are picky about this one patch of reedy grass I end up cutting myself.

For the small part of my yard that isn’t garden, I have used my line trimmer (weed whacker) occasionally when my push-style rotary needed repair. I would love to use sheep, but they just might like my garden too much.

Guy up the street had a goat for years. Good looking lawn too.

This question is for developed countries, but will a little information from a developing country be helpful?

We don’t have lawn here. People don’t like grass growing, except in soccer pitches. A “lawn” is something unknown to most here.

However, we do have some method of getting rid of grass. Pickaxes and shovels are called for. We use them to dig the ground then pick up the pile of ground (along with the grass) and throw away. Those who are less fortunate to have pickaxes or shovels have to manually pick the grass one by one. A lot of energy is needed for the job.

They use a long handled sickle to cut grass and grain crops. Similar to this one http://www.forestrytools.com.au/userfiles/BLK737___ex.jpg

Goats, sheep.

A strimmer, garden shears or if the grass is long a scythe

Depending upon where you live you can buy ground cover that (supposedly) looks like grass but does not need to be cut.
I tried some a few years ago. It looked great but you had dead spots in the shape of footprints if you walked on it.

@cookieman A single goat? How sad. And odd. Did it yell constantly?

Sheep, goats, push mower, scythe. The first two are charmingly pastoral, the second are a great workout. There is actually a proper way to use a scythe in which you won’t work yourself to death attempting a minor chore. It’s all in the easy swing. It takes less energy than pushing a bloody old mower in the hot sun. It also makes an excellent prop on Halloween, or a bone-chilling warning to the neighborhood rapscallions.

scythes

Thanks. All helpful answers including yours @Mimishu1995 to answer your question.
I suppose the scythe is being used in the country side, right?

….And the goats, sheep too are being used in the countryside I guess? Have you seen goat or sheep use by individual home owners in a city? I suppose some city municipalities use them in the parks etc.? Do you know which ones?

@flo Boston, for one.

Thanks @wildpotato Thanks all.

So why don’t people use rotary push mowers for the noise factor?

Push mowers are good exercise. Their sound is very reassuring, a sign that all is well with the world.