[Sentinel]

you can do your research to see if true or not. those medical information shouldn't be fake. those experience he encountered coincide with other doctors testimonies. so imo, i trust it lo 

I know it affects those 40 yrs and younger, esp teenagers but what is puzzling to me is why it does not affect those seniors and elderlies.

Should not be age bias, but apparent it is. I would never expect it to affect a young heart but not an old heart.