Does the privilege against self-incrimination apply to hardened criminals but not to children?

'It would indeed be surprising if the privilege against self-incrimination were available to hardened criminals but not to children. The language of the Fifth Amendment, applicable to the States by operation of the Fourteenth Amendment, is unequivocal and without exception. And the scope of the privilege is comprehensive. As Mr. Justice White, concurring, stated in Murphy v. Waterfront Commission, 378 U.S. 52, 94, 84 S.Ct. 1594, 12 L.Ed.2d 678, at 704 (1964):