Use of the colon (:) modifier
The other way to accomplish the same goal (reading in nonstandard data with list input) is to specify the informats directly in the INPUT statement.

DATA COLONS;  
   INPUT ID   
	LASTNAME : $20.   
	DOB : MMDDYY8.  
	HEIGHT   
	WEIGHT   
	GENDER : $1.   
	AGE;  
FORMAT DOB MMDDYY8.;  
DATALINES;

The effect is: