21.— The Principal Act is amended—

(a) in section 142A(4) (as amended by section 6 of the Act of 2009)—

(i) in paragraph (a), by substituting “period of unemployment” for “period of interruption of employment”, and

(ii) by inserting the following paragraph after paragraph (a):

“(aa) the period of unemployment commenced on or after 29 April 2009 and in the period commencing on 29 April 2009 and ending on 29 December 2009 the claimantattained the age of 20 years,”,

and

(b) in section 142B(3)(a) (inserted by section 6 of the Act of 2009) by substituting “period of unemployment” for “period of interruption of employment”.