The man was taken to hospital for treatment to a head injury which is described as serious, as well as a broken collar bone. However, these injuries are not believed to be life threatening at present.
Police arrested a 22-year woman at the scene of the incident. She was taken to Bangor PSNI station for questioning.
Police in Newcastle are appealing for anyone who witnessed the assault or anyone with any information about the incident to contact them on 0845 600 8000. Or, if someone would prefer to provide information without giving their details, they can contact the independent charity Crimestoppers and speak to them anonymously on 0800 555 111.