Your brain at 40

FLUID INTELLIGENCE (your current) -> WISDOM INTELLIGENCE

• Intellectual professions you can focus for a long time
• FLUID INTELLIGENCE

This PEAKS AT 39

Second intelligence curve

Raymond Cattell — Raymond Bernard Cattell was a British-American psychologist, known for his psychometric research into intrapersonal psychological structure. Wikipedia

Second intelligence is not for scientists. It’s about WISDOM. So my second career makes sense