According to a certain film star's biography page at IMDB, there are five performers who have been nominated for acting Oscars in five different decades.
In alphabetical order, they are:
(1) Male, nominated in 1960s, 70s, 80s, 90s, 2000s
(2) Female, nominated in 1930s, 40s, 50s, 60s, 80s (not 70s)
(3) Male, nominated in 1950s, 60s, 80s, 90s, 2000s (not 70s)
(4) Male, nominated in 1960s, 70s, 80s, 90s, 2000s
(5) Male, nominated in 1930s, 40s, 50s, 60s, 70s
Can you name them?