Final answer:
Engaging in mentally and physically stimulating activities and maintaining a healthy lifestyle can minimize cognitive decline of fluid intelligence.
Step-by-step explanation:
The conditions that minimize cognitive decline of fluid intelligence include engaging in mentally and physically stimulating activities.
Research has found that adults who participate in activities like reading, playing chess, or completing crossword puzzles experience less cognitive decline. These activities help keep the brain mentally fit and improve fluid intelligence.
Additionally, maintaining a healthy lifestyle with proper exercise, nutrition, and an active lifestyle can also minimize cognitive decline.