; and (ii) (I) sought to acquire the status of an alien lawfully admitted for permanent residence during the 2-year period beginning on the date on which an immigrant visa became available to such alien; or (II) demonstrates, by clear and convincing evidence, that the alien's failure to seek such status during such 2-year period was due to extraordinary circumstances. . (b) Nonimmigrant dependent children of H-1b nonimmigrants Section 214 of the Immigration and Nationality Act ( 8 U.S.C. 1184 ) is amended by adding at the end the following: (s) Child derivative beneficiaries of H-1b nonimmigrants (1) Age determination In the case of an alien who maintained, for an aggregate period of at least 8 years before reaching 21 years of age, the status of a dependent child of a nonimmigrant described in section 101(a)(15)(H)(i)(b) pursuant to a lawful admission, such alien’s age shall be determined based on the date on which an initial petition for classification under such section was filed on behalf of the alien’s parent, if such petition is approved. (2) Long-term dependents Notwithstanding the alien's actual age or marital status, an alien who is determined to be a child under paragraph (1) and is otherwise eligible may change status to, or extend status as, a dependent child of a nonimmigrant described in section 101(a)(15)(H)(i)(b) if the alien’s parent— (A) maintains lawful status under such section; (B) has an employment-based immigrant visa petition that has been approved pursuant to section 203(b)