The Age of Degeneration lies in the future after Sakyamunis earthly lifetime. It does not denote a specific era. Whenever we ordinary people reflect seriously on the quality of our lives, we realize that we live far from the spirit of the Buddha. Our minds are soiled with evil and illusions. This actual state of human beings is what is called the Age of Degeneration. The Lotus Sutra warns us that it will be our normal state once the Buddha has departed from among us.
Introduction to the Lotus Sutra