Talk:Half-human/@comment-91.19.106.156-20160703010038/@comment-10733658-20160703080434

^ There's no indication that they literally age at a faster rate, at least externally. Arima's career is documented enough to know he actually was as old as he's listed as being. Rather, their internal organs are under greater strain and so they break down faster than a normal person.

Glaucoma involves pressure and strain on the optic nerve, which causes the person to go blind. Hair going white or grey is an auto-immune response, which is why people get it at different points in their life.