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Thanks for the reassurance. Do you think it's better to leave the moss alone too? I've read somewhere that it could be harmful for concrete tiles...

It's a house built in the 1970, so the roof must be of original construction. From what I can see, the tiles are plain concrete type (?). After reading numerous websites, the apparent life span of those varies widely, from 25 to 60 plus years. Roofing companies usually give it just 25-30 years...