No TPTP formula. May not be expressible in strict first order.	Mid-level-ontology.kif 323-330	If an entity is an instance of teenager and the age of the entity is a real number year duration(s) holds during a time position, then the real number is greater than 12 and the real number is less than 20
No TPTP formula. May not be expressible in strict first order.	Mid-level-ontology.kif 252-257	If an entity is an instance of human youth and the age of the entity is a real number year duration(s) holds during a time position, then the real number is less than 18

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