When you are born, because it's genetic.
The Marfan syndrome is a connective tissue disorder. The Marfan syndrome is inherited and affects many parts of the body. There's no single test for diagnosing it, but people who have it often have many similar traits. Besides perhaps having heart problems, people with the Marfan syndrome are often tall and thin. They also may have slender, tapering fingers, long arms and legs, curvature of the spine and eye problems. Sometimes the Marfan syndrome is so mild that few symptoms exist. In the most severe cases, which are rare, life-threatening problems may occur at any age.
This condition is much more prevalent in patients with Marfan syndrome than in the general population.
Tourette syndrome is characterized by uncontrollable vocalization
The usual age of onset is between 25 and 80 years of age, with a peak age of onset at 40 years old. However it can rarely occur in those in teenage years, as i myself have TOS at 15.
It often has 2 stages - difficulty at birth due to hypotonia, followed by the onset of hunger and other symptoms at between 1 and 4 years of age.
the average age of onset bipolar symptoms is 21 years of age. These signs may be dismissed as "growing pains" or normal teenage behavior. On occasion, some people have their first symptoms during childhood, but the condition can often be misdiagnosed at this age and improperly labeled as a behavioral problem.
Typically in childhood around age 5. However there have been rare cases reported of what is often termed adult-onset tic disorder NOS. NOS stands for Not otherwise specified.
Marfan patients often develop striae over the shoulders, hips, and lower back at an early age because of rapid bone growth. Although the patient may be self-conscious about the striae, they are not a danger to health.
Symptoms of the disease appear before age 15
At birth, infants tend to be without symptoms and usually do not develop them until approximately six months of age.
The onset of symptoms, such as a lack of head control and poor muscle tone, usually begins by two to three months of age
The rate of mutation of the fibrillin gene, however, appears to be related to the age of the patient's father; older fathers are more likely to have new mutations appear in chromosome 15.