To mark the occasion, the current President, Tarja Halonen and her husband will host a dinner for Koivisto and a number of invited guests on Wednesday.
Koivisto served two six-year terms as President from 1982 to 1994. He was Prime Minister in two governments, from 1968 to 1970 and from 1979 to 1982, and he also served as Governor of the Bank of Finland.
Koivisto was the ninth President of the Republic of Finland.