Intelligence
At What Age Is IQ Highest? And Does It Decline?
Different abilities peak decades apart. Here is the evidence for each, when decline really begins, and why your IQ score stays steady while your raw abilities change.
6 min read
LifeScore Editorial Team
The LifeScore Editorial Team writes and updates the LifeScore Journal. We are writers and editors, not clinicians. We explain published psychology research in plain English, cite the studies we rely on, and correct articles when the evidence changes or a reader spots a mistake. Nothing we publish is a diagnosis or a substitute for professional advice.
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We cite what we claim
Every factual claim in a rewritten article points to a study, a test publisher or an official source, listed under References. If we cannot find a source, we cut the claim.We say what our test is
The LifeScore IQ test is a 25-question online visual reasoning test. It gives an estimate, not a clinical score, and the full report is a paid unlock. We say so wherever we mention it.We do not diagnose
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Articles show the date they were last updated. When a reader points out an error, or new evidence changes the picture, we fix the article.
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Recently updated
All 173 articlesIntelligence
Fluid vs Crystallized Intelligence: What Each One Means
One is reasoning on the spot, the other is knowledge you have built up. Here is how psychologists separate them, measure them and track them across a lifetime.
8 min read
Intelligence
Hard IQ Test Questions, Explained
Why some puzzle items stump almost everyone, with four hard practice questions worked through step by step.
8 min read
Intelligence
How Accurate Are Online IQ Tests?
Reliability, validity and norms explained, what separates a useful online test from a flattering quiz, and what your score can and cannot tell you.
10 min read
Intelligence
How Long Does an IQ Test Take? Every Test, Compared
Sourced times for the WAIS, Stanford-Binet, Raven's, Mensa and online tests, plus what else fills the appointment and how long you wait for results.
7 min read
Intelligence
How Much Does an IQ Test Cost? US and UK Prices
Real 2026 prices for a psychologist, a Mensa session and online tests in the US and UK, what each one buys you, and how to avoid the subscription traps that catch thousands of people.
8 min read
Intelligence
How to Find Out Your IQ: Every Option, Compared
A psychologist, a Mensa session, an old school record or an online reasoning test. What each one involves, what it costs, how long it takes and how much you can trust the number.
9 min read
Intelligence
How to Prepare for an IQ Test: What Actually Helps
What the research says about practice, sleep, caffeine, nerves and brain training, with three practice puzzles so you can see the format before the real thing.
8 min read
Intelligence
How to Solve Matrix IQ Questions, Step by Step
The five rules behind almost every matrix puzzle, a four-step method that works on all of them, and six interactive examples with the wrong answers explained.
7 min read
