Newer or more modern

Is it right to say “This castle is newer” instead of more modern.
And what about a newer house and a newer building?

The adjective new refers to the age of something whereas modern describes the style, fashion or technology of something. So, a castle could be newer but less modern than another one.[YSaerTTEW443543]

TOEIC listening, photographs: A father canoeing with his son[YSaerTTEW443543]

Thank you very much, Torsten, for all your explanations.