Republican movement losing ground: poll

Support for a republic has plummeted to a 20-year low, according to a new poll.

Just 39.4 per cent of Australians say they support a republic, the ReachTEL poll published in Fairfax Media says.

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Of the more than 2100 people asked about their views on Thursday night, 41.6 per cent said they were against Australia becoming a republic, while 19 per cent say they didn't have an opinion on it.

Older Aussies are more likely to be against a republic, while people aged 35-65 are most likely to give it the tick of approval.

But in a blow to the republican movement, which hopes to cut ties with the royal family, more people aged 18-35 oppose a republic than support it, the poll shows.

Australians for a Constitutional Monarchy national convener David Flint says young people seem to be disinterested in the issue, while liking the star power William and Kate, not to mention Prince Harry.

"That is a time bomb, I believe, for republicans, because you don't have that investment for the future," Professor Flint told Fairfax.