Final answer:
The most commonly used drugs for treating Parkinson's disease in individuals over 65 are Levodopa-carbidopa and Selegiline.
Step-by-step explanation:
The most commonly used drugs for treating Parkinson's disease in individuals over 65 are Levodopa-carbidopa and Selegiline. Levodopa-carbidopa is a medication that helps increase dopamine levels in the brain, alleviating the symptoms of Parkinson's. Selegiline, on the other hand, inhibits the enzyme that breaks down dopamine, prolonging its effects.