One of his most famous works is the novel Aniara (1956) which in 1959 became an Opera, composed by Karl-Birger Blomdahl.
Links:
http://www.kirjasto.sci.fi/harrymar.htm
... who are 65 years of age or older. The median age is 41 years. For every 100 females there are 92.6 males. For every 100 females age 18 and over, there are 90.2 ...