Evidence‑Based Evaluation and Management of Cognitive Dysfunction in Young AdultsGenetic and Neurodevelopmental ConsiderationsPsychiatric and Mood DisordersMedication and Substance‑Related CausesMetabolic, Endocrine, and Nutritional FactorsSleep‑Related ContributorsHormonal and Reproductive InfluencesDiagnostic Work‑up RecommendationsKey Clinical Pitfalls to Avoid