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suggestedAge

A Schema.org Property

This term is proposed for full integration into Schema.org, pending implementation feedback and adoption from applications and websites.
The age or age range for the intended audience or person, for example 3-12 months for infants, 1-5 years for toddlers.
Values expected to be one of these types
QuantitativeValue
Used on these types
PeopleAudience
SizeSpecification

Source

https://github.com/schemaorg/schemaorg/issues/2811