A 80-year-old man can potentially take Modalert (modafinil) if prescribed by a healthcare provider, but caution is advised due to age-related changes in drug metabolism and potential health conditions. Before starting Modalert, it’s essential to evaluate kidney and liver function, as these organs process the medication. Older adults are also more likely to have other medical conditions or take medications that may interact with Modalert, increasing the risk of side effects like insomnia, headache, or elevated blood pressure. A healthcare provider will assess the individual’s overall health, medication history, and the severity of their condition (such as narcolepsy) to determine the appropriate dosage and monitor for any adverse effects.