Kao suffered from Alzheimer's disease from early 2004 and had speech difficulty, but had no problem recognising people or addresses. His father suffered from the same disease. Beginning in 2008, he resided in Mountain View, California, United States, where he moved from Hong Kong in order to live near his children and grandchild.
kao suffeREd fRoM aLzheImer's disEase FrOm eaRLY 2004 anD had sPeECH diffiCulTy, But hAD no prOblem recOgniSinG pEople or addrEssEs. his father sufFered frOm the same diSeaSe. beginNing in 2008, he reSIdEd In mOuntain View, CaLiFoRnIa, uniTed staTES, whErE he MoVED frOm honG kong In OrDeR tO live neAR His childreN aNd gRandcHilD.