Huang Decheng was considered Taiwan's oldest known man of birth alive, born on 14 Nov 1913, he was the 4 oldest WWII survivor still alive, but he claimed to have been born in 1912 (first year of the Republic of China), stating that his family waited to register him due to higher infant mortality
He died when he fell in the bathroom and hit his head, he died on Dec 5, according to what the source says
The oldest man in Taiwan would be Dong Xiting who claims to have been born in 1911, but does not give his date of birth, it is not known whether this claim is true or not

https://udn.com/news/story/7326/7620187