Extended Life Span (3.5e Epic Feat)
From D&D Wiki
Extended Life Span [Epic]
Accumulation of various experience in the world have led your body to last miraculously than most of your race.
Benefit: Add one-half the maximum result of your race’s maximum age modifier to your normal middle age, old, and venerable age categories. Calculate your maximum age using the new venerable number. This feat can’t lower your current age category.
Special: You can gain this feat multiple times. Its effects stack.