The Citing Half-Life is the median age of articles cited by the journal in the JCR year. Half of the cited articles were published before the Citing Half-Life, and half were published after the Citing Half-Life. In the example histogram, a journal made 10,500 citations during the JCR year (the JCR year is the period marked "0-1"). The Citing Half-Life is 4.6, meaning the median age of the cited articles is 4.6 years old (inclusive of JCR year). Half of the cited articles are newer than 4.6 years old (orange zone), and half are older (blue zone).