Hi, is there a link between ms and tmj? and what's late onset ms? thank you?

There is no link between multiple sclerosis and TMJ. Visit this site for information on MS: https://www.mayoclinic.org/diseases-conditions/multiple-sclerosis/symptoms-causes/syc-20350269

Studies have shown multiple sclerosis is a possible etiological factor in temporomandibular disorders but not vice versa. Most people start to get MS symptoms between 20 and 40 years old. But sometimes, you won’t have any MS symptoms until you’re 50 or older. When this happens, doctors call it later-onset multiple sclerosis (LOMS).

First, there is NO cause and effect between MS and jaw pathology of any type. TMJ syndrome is a co-morbidity. Since the average age of onset of MS is age 31 yrs., "Late Onset" would refer to those patients who were diagnosed in their 50's and 60's. However, we often consider that the disease started years earlier, just not diagnosed until later.