Irritable bowel syndrome
Table:
Irritable bowel syndrome
Other names	Spastic colon, nervous colon, mucous colitis, spastic bowel[1]

Drawing of the pain of IBS
Specialty	Gastroenterology
Symptoms	Diarrhea, constipation, abdominal pain[1]
Usual onset	Before 45 years old[1]
Duration	Long term[2]
Causes	Unknown[2]
Diagnostic method	Based on symptoms, exclusion of other diseases[3]
Differential diagnosis	Celiac disease, non-celiac gluten sensitivity, microscopic colitis, inflammatory bowel disease, bile acid malabsorption, colon cancer[3][4]
Treatment	Symptomatic (dietary changes, medication, probiotics, counseling)[5]
Prognosis	Normal life expectancy[6]
Frequency	12.5% (developed world)[1][7]

Looking at the table, assess whether the statement is entailed, neutral, or refuted. Conclude with JSON {"answer": "YOUR ANSWER"} — nothing else.

Claim: IBS occurs before adults reach senior age.

answer: entailed