OP worded it poorly, here's the stuff (posting from phone so formatting might be off):
"Almost all Alzheimer’s disease patients younger than 30 have pathological gene mutations, according to the authors. To date, the youngest person known to have been diagnosed with Alzheimer’s disease was a 21-year-old who carried a gene mutation.
But the adolescent patient of the most recent study differed from previous young patients because no known genetic mutations were identified in the 19-year-old who was diagnosed in China."
jxyzptlk t1_j8a5l83 wrote
Reply to comment by stewartm0205 in Chinese researchers have reported what they claim is the world’s youngest person diagnosed with Alzheimer’s disease, which may overturn the conventional perception that cognitive impairment rarely occurs in young people. by Wagamaga
OP worded it poorly, here's the stuff (posting from phone so formatting might be off):
"Almost all Alzheimer’s disease patients younger than 30 have pathological gene mutations, according to the authors. To date, the youngest person known to have been diagnosed with Alzheimer’s disease was a 21-year-old who carried a gene mutation.
But the adolescent patient of the most recent study differed from previous young patients because no known genetic mutations were identified in the 19-year-old who was diagnosed in China."