system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do certain toys and boardgames have an upper age limit, usually 99.
gpt
For games designed for very young children, the mechanics might not be engaging for those who are older. Candy Land is great for a 3-year-old to learn colors. Not so much fun for a 12-year-old.

For those with a high limit such as 99, it's simply a lighthearted joke, as they usually say from 9 - 99. If 100-year-old gran gran wants to join in, pull up a chair for her.