Hawking was diagnosed with motor neurone disease (at the age of 21 in 1963) related to amyotrophic lateral sclerosis, also known as Lou Gehrig's disease, a condition that has progressed over the years. As of 2013, he is almost completely paralysed and communicates through a speech generating device. Hawking's illness has advanced more slowly than typical cases of ALS: survival for more than 10 years after diagnosis is uncommon.[198][199] Symptoms of the disease include increasing inability to control physical movements, including vocal functions, and severe coughing spells. Hawking describes himself as lucky, as the slow progression of his disease has allowed him time to make influential discoveries and has not hindered him because, in his words, of "the help I have received from Jane, my children, and a large number of other people and organisations"