The remaining World Champions under the old formats

Below is the list of classical world champions under the old formats. On the men's side, different world championship formats were experimented after 1993. The title was finally united in 2006 by Kramnik, followed by Anand. On the women's side, the same happened after 1999.

After the recent passing of Vasily Smyslov, Boris Spassky is now the oldest living classical world champion under the old formats, followed by Anatoly Karpov. On the women's side, it is Nona Gaprindashvili, followed by Maia Chiburdanidze.

Undisputed Men's Classical World Champions under the old formats:

#	Name	Year	Country	Age
1	Wilhelm Steinitz	1886–1894	Austria-Hungary (Bohemia) United States	50–58
2	Emanuel Lasker	1894–1921	Germany	26–52
3	José Raúl Capablanca	1921–1927	Cuba	33–39
4	Alexander Alekhine	1927–1935 1937–1946	France Russian émigré	35–43 45–54
5	Max Euwe	1935–1937	Netherlands	34–36
6	Mikhail Botvinnik	1948–1957 1958–1960 1961–1963	Soviet Union (Russia)	37–46 47–49 50–52
7	Vasily Smyslov	1957–1958	Soviet Union (Russia)	36
8	Mikhail Tal	1960–1961	Soviet Union (Latvia)	24
9	Tigran Petrosian	1963–1969	Soviet Union (Armenia)	34–40
10	Boris Spassky	1969–1972	Soviet Union (Russia)	32–35
11	Bobby Fischer	1972–1975	United States	29–32
12	Anatoly Karpov	1975–1985	Soviet Union (Russia)	24–34
13	Garry Kasparov	1985–1993	Soviet Union (Azerbaijan) Russia	22–30

Women's Classical World Champions under the old format:

Name	Years	Country
1 Vera Menchik	1927–1944	Russia / Czechoslovakia / England
2 Lyudmila Rudenko	1950–1953	Soviet Union / Ukraine
3 Elisabeth Bykova	1953–1956	Soviet Union / Russia
4 Olga Rubtsova	1956–1958	Soviet Union / Russia
5 Elisabeth Bykova	1958–1962	Soviet Union / Russia
6 Nona Gaprindashvili	1962–1978	Soviet Union / Georgia
7 Maya Chiburdanidze	1978–1991	Soviet Union / Georgia
8 Xie Jun	1991–1996	People's Republic of China
9 Susan Polgar	1996–1999	Hungary / United States

Source: Wiki