CREATE TABLE table_204_561 (id NUMBER, "fence" NUMBER, "name" CLOB, "jockey" CLOB, "age" NUMBER, "handicap  ( st-lb ) " CLOB, "starting price" CLOB, "fate" CLOB)

what is the total age of what a myth and rough tweed ?
SELECT SUM("age") FROM table_204_561 WHERE "name" IN ('what a myth', 'rough tweed')
SELECT SUM("age") FROM "table_204_561" WHERE "name" IN ('what a myth', 'rough tweed')