I have a bottle of Royal Salute, purchased in 1981.
I realize that aging in the bottle doesn't count, but....
21 + 24 means that the scotch is 45 years old.
Had to buy a bottle of 18 yr. old Chivas to keep me out of the Royal Salute.
Let me know when you crack the 45 yo bottle; I'll need to taste it for posterity's sake.