what is the life expectancy of a person with tay sachs disease?
The condition is usually fatal by around 3 to 5 years of age, often due to complications of a lung infection (pneumonia). Rarer types of Tay-Sachs disease start later in childhood (juvenile Tay-Sachs disease) or early adulthood (late-onset Tay-Sachs disease). The late-onset type doesn't always shorten life expectancy.