2003 Mazda 6 Too much mileage ?

I'm looking to buy a used and I really like the 2003 Mazda 6 but it has 190,000 and I was wondering if that's to much for a 2.3 litre engine. I have also seen others the same but with an extra 20,000 30,000 kms on them I also wanted to know if there is anything else I should know before buying a car so I no I'm getting a car that's not going to cost a lot of money in the future