Hoketsu is the oldest Olympian to compete for Japan. He is the second oldest Olympian after Oscar Swahn who was a 72-year-old Swedish shooter who won bronze medal at the 1920 Summer Olympics in Antwerp.
- "London 2012 Olympics: Japan hoping stage is set for old campaigner Hiroshi Hoketsu's golden age," The Telegraph (UK); excerpt, "... the oldest Olympian to compete at any Games for 92 years. 'The Hope of Old Men', they call him ..."; retrieved 2012-7-20.
- Topend Sports Network, "Japan at the Olympics"; retrieved 2012-7-20.
- Sports Reference.com (SR/Olympics), "Hiroshi Hoketsu" Archived 2009-03-18 at the Wayback Machine; retrieved 2012-7-20.
- Dressage.com, Hiroshi Hoketsu; retrieved 2012-7-20.