Bilingualism has been shown to have a strong protective effect against dementia, delaying the diagnosis of Alzheimer's disease by up to 4 years. The purpose of the study is to test whether learning a second language using Duolingo software could improve cognitive functions in older adults.

This study is a 3-arm, randomized controlled trial. The primary objective of the study is to test the impact of second language acquisition through short-term use of the Duolingo app on cognitive functioning, particularly executive function in older adults compared to a brain training application.

Inclusion Criteria:

• Participants must have normal vision and hearing.
• Participants must be able to travel to Baycrest by personal or study-arranged automobile, or public transportation.
• Participants must be monolingual native English speakers.
• Participants must be willing to provide informed consent.
• Participants must have daily access to a smartphone/mobile device.
• Have not previously studied Spanish formally, nor any other language in the past 10 years.

Exclusion Criteria:

• have a neurological disorder.
• meet DSM-IV-TR criteria for Axis I mood, anxiety, or psychotic or substance abuse disorders.
• Fluent in more than one language.