the intck function takes a date not a string. data test2;
set test1;
if ageu='Year' THEN NEW_AGE=AGE;
else if ageu='Mon' THEN NEW_AGE=round(AGE/12, 0.01);
else if ageu not in ('Year', 'Mon') and RFICDTC ne '' and BRTHDTC ne '' then NEW_AGE=intck('year', input(RFICDTC,yymmdd10.), input(BRTHDTC,yymmdd10.));
else new_age=.;
run; also notice that strings are case sensitive. You want 'Year' not 'year'
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