Concerning your inquiry asking if children under fifteen of
non-Bahá'í parents could attend Nineteen Day Feasts or other events held
exclusively for Bahá'ís when the children consider themselves as Bahá'ís, such
children may be permitted to attend Bahá'í functions provided that their
parents have given their consent. This applies only, of course, to children
under the age of fifteen years.
- The Universal House of Justice (From a letter dated 4 August 1970 to the National Spiritual Assembly of Nicaragua; The Compilation of
Compilations vol. I, The Nineteen Day Feast)