~以上
At least this amount or more
You'll be able to set a lower boundary that is included in a number or range.

このゲームは三人以上で遊べます。
kono geemu wa sannin ijou de asobemasu.
What do you think this sentence means?
This game can be played by three or more people.
Include a lower boundary
~以上 means at least the stated number: the boundary itself is included. It is useful for minimum ages, amounts, or group sizes.
千円以上買うと、送料無料です。
sen'en ijou kau to, souryou muryou desu.
Shipping is free when you spend at least one thousand yen.
Form and use ~以上
十人以上 includes exactly ten and any higher number. It does not mean strictly more than ten. Keep the counter with its number.
千円以上買うと、送料無料です。
sen'en ijou kau to, souryou muryou desu.
Shipping is free when you spend at least one thousand yen.
一時間以上待ちました。
ichijikan ijou machimashita.
I waited for at least an hour.
この映画は十八歳以上の人しか見られません。
kono eiga wa juuhassai ijou no hito shika miraremasen.
Only people aged eighteen and over can see this movie.
三千円以上買い物をした人は、駐車場が無料です。
sanzen'en ijou kaimono o shita hito wa, chuushajou ga muryou desu.
Parking is free for people who spend 3,000 yen or more.
病院で二時間以上待ちました。
byouin de nijikan ijou machimashita.
I waited at the hospital for more than two hours.
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