Authoritative guides on IQ testing, scoring methodology, careers, and our product.
There is no single peak age. See how 10 professions map onto the abilities that peak at 19, 25, or the late 60s, and why experience offsets raw-speed decline.
Decade-by-decade IQ data from Hartshorne, Salthouse, Schaie, and Singh-Manoux shows no single peak age. See which abilities decline, hold, or rise after 45.
Cognitive intelligence predicts job performance better than any other trait. Learn the science behind g-factor, fluid vs. crystallized IQ, and career impact in 2026.
How IQ scores distribute across the US population. Where you rank, what each standard deviation means, and career implications.
AI Engineers earn $200k-$450k in 2025. ML Architects command $250k+. See which high-paying tech roles match your cognitive profile.
McKinsey, BCG, and Bain hire from the top 1% of IQ scores. Cognitive thresholds, compensation data, and case interview tips.
Cognitive thresholds for Investment Banking. IQ requirements, salary correlations, and the mental demands of Wall Street.
IQ predicts income only up to ~$70K, then plateaus. The top 1% of earners score lower than those just below. See the data.