Daiyaku is 42 years old for men and 33 years old for women.
The year before that is called Maeyaku, and the year after that is called Koyaku. Unlucky year is considered to be a year to refrain from deeds and behavior because there are many misfortunes from the old days.
It is said that people who have a bad year will get rid of bad luck by receiving a knife that cuts off bad luck and a fire chopstick that repels bad luck.