Which Year born (Age) has a Current Club of sporting al riyadi beirut, and a Position of pf?
CREATE TABLE "fiba_world_olympic_qualifying_tournament" (
  "player" text,
  "height" real,
  "position" text,
  "year_born_age" text,
  "current_club" text
);
SELECT "year_born_age" FROM "fiba_world_olympic_qualifying_tournament" WHERE "current_club"='sporting al riyadi beirut' AND "position"='pf';