Roof Replacement Oakton VA

Hi,
Hard to get proper info, but I'm looking for guidance on a full roof replacement. My home is about 200sqm in size and presently has concrete/cement roof tiles. It was built in 1980. After the crazy weather, we had a roofer come and do a minor repair to the roof, but he is now saying that the roof has had it and a full roof replacement is required. It is very expensive and it's very difficult to gauge what is a reasonable cost.
So far, I have had; https://restonroof.com/oakton-va.php
2 quotes to replace existing roof with colorbond – one quote was $50K the other quote was $60K.