; (2) by striking subparagraph (B) and inserting the following: (B) At the option of the State and youth involved, the term shall include a youth who is in foster care under the responsibility of the State. ; and (3) by adding at the end the following: (C) The term shall include a youth— (i) (I) with respect to whom an adoption assistance agreement is in effect under section 473 if the youth had attained 16 years of age before the agreement became effective; or (II) with respect to whom a kinship guardianship assistance agreement is in effect under section 473(d) if the youth had attained 16 years of age before the agreement became effective; and (ii) who has not attained 19, 20, 21, or 22 years of age, as the State may elect. (D) In this paragraph, the term youth means an individual— (i) who has attained 18 years of age; and (ii) who has not attained 22 years of age. . (b) Guidance and technical assistance The Secretary of Health and Human Services shall provide guidance and technical assistance to States on best practices for outreach to youth who are newly eligible for services as a result of the enactment of this section. 4. Promoting the re-entry of youth into extended foster care (a) In general Section 471(a) of the Social Security Act ( 42 U.S.C. 671(a) ) is amended— (1) by striking and at the end of paragraph (36); (2) by adding and at the end of paragraph (37); and (3) by adding at the end the following: (38) if the State exercises the option provided for in section 475(8), shall— (A) permit any youth who has attained 18 years of age and meets the requirements of section 475(8)(C) to voluntarily re-enter foster care