It’s perfectly correct to say that a company is 20 years old. I would only use “established” if you were also going to include other information.
My company was established 20 years ago by my father and my uncle.
2019年10月21日
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Thanks for your quick check, Steve.
2019年10月20日
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I’d say, “X was established 20 years ago.” Or perhaps better, “X was established in 1999.”