when the system opens after the age of 100

The phrase "When the system opens after the age of 100" refers to a story or concept where a system activates or "opens" when a person reaches the age of 100. Specifically, in this context, the system activates for a character around the age of 100 years, granting various benefits such as increased strength, longevity, cultivation abilities, and rewards. The system seems to be tied to family prosperity and continuation, encouraging childbirth and growth of descendants. This concept is from a fictional series titled "When The System Opens After The Age Of 100, All Grandchildren Kneel Upon The Mountains!" The story features a time-traveler named Xiao Chen who, at nearly 100 years old, has a system activated that reverses lifespan, enhances strength, and offers rewards for family growth and cultivation. The system activation comes with various powers, rewards, and encourages procreation within the family lineage after the age of 100. In short, the system opens or activates specifically when the protagonist reaches or passes the age of 100 years, marking a transformative point with substantial benefits related to longevity and family continuance.