You have to be a little more specific. There are many health issues that could cause a person not to be able to speak.
Stroke
Mini stroke
Dementia
Head injury
Adult brain tumor
Creutzfeldt-Jackob Disease and Mad Cow Disease
babies would usually start to talk full sentences around the age of 2 and up.
I talk hoarsely.
you cant talk on crossfire
yes
You cant talk on pet party
3-year-olds talk in their sleep all the time. Sometimes it's coherent, sometimes it's not.
Why cant i talk on one topic
no
it cant talk
You cant.
They cant talk.
Nope.... it cant