Specific childhood dementia disorders are all quite rare, though some are more common in certain populations.
In a 2023 review, researchers estimated that childhood dementia disorders collectively occur in 84 in 100,000 live births.
Taken together, currently untreatable childhood dementias occur in about 1 in 2,900 live births.
In the United States, experts estimate that childhood dementias are responsible for about 1,000 deaths per year.