data newclass(keep=first_name sex weight yearborn);
  set sashelp.class(drop=height rename=(name=first_name));
  yearborn=year(date())-age;
  if yearborn >2002;
run;

Data specifies the target data set. Keep option specifies columns to print to target.

Set specifies source data set. Drop specifies columns not to take. Rename renames name to first_name.

Yearborn is a calculated implicit numeric variable (column).

Filter and implicit output data with if for pupils born after 2002.