CREATE TABLE table_2582 ("Position" TEXT, "Horse" TEXT, "Jockey" TEXT, "Age" FLOAT, "Handicap  ( st-lb ) " TEXT, "SP" TEXT, "Distance" TEXT, "Prize money" TEXT)

How old was the horse when the SP was 200/1?
SELECT COUNT("Age") FROM table_2582 WHERE "SP" = '200/1'
SELECT COUNT("Age") FROM "table_2582" WHERE "SP" = '200/1'