Bordeaux Wine Enthusiasts

My family and I have decided to open a few bottles of Chateau Gruaud Larose for a special occasion. We are planning to open 1997, 1998, 1999, 2000, and 2002 of Chateau Gruaud Larose can anyone suggest how long I should decant these for? Thank you !

I would open the 2000 and 2002 4-6 hours before dinner, 1998 and 1999 3-5 hours before, and the 1997 1-2 hours before. I would decant before serving only if tasting at that point suggest that decanting would help.