(e) Definitions In this Act: (1) Lived experience The term lived experience means persons who have lived experience of homelessness, as defined by section 103 of the McKinney-Vento Homeless Assistance Act ( 42 U.S.C. 11302 ) and includes homeless children and youths as defined in section 725 of such Act ( 42 U.S.C. 11434a ), or other youth-serving systems, as defined by agencies that serve children, youth, and families. Agencies may include the Department of Health and Human Services, Department of Education, Child Welfare, Department of Juvenile Justice, and agencies serving homeless youth. (2) Secretary The term Secretary means the Secretary of Housing and Urban Development. (3) Youth The term youth means not older than 17 years old. (4) Young adult The term young adult means— (A) 18 years or older but not older than 30 years old