The answer is only 4.
The ordinaries are:
- Bishop Gilbert Guillaume Marie-Jean Aubry of Saint-Denis-de-La Réunion
- named 20 Nov 1975
- born 10 May 1942
- age 73.32 (as of 8 Sep 2015)
- Bishop Jean-Claude Bouchard, O.M.I. of Pala, Chad
- named 26 Feb 1977
- born 25 Sep 1940
- age 74.95 (as of 8 Sep 2015)
- Bishop Armando Umberto Gianni, O.F.M. Cap. of Bouar, Central African Republic
- named 27 Feb 1978
- born 23 Sep 1939
- age 75.95 (as of 8 Sep 2015)
- Archbishop Zacchaeus Okoth of Kisumu, Kenya
- named Bishop 27 Feb 1978
- elevated to Archbishop 21 May 1990
- born 5 Jul 1942
- age 73.17 (as of 8 Sep 2015)
All of them were named by Pope Paul VI.
You'll notice that many of them are at or near the retirement age. Before they do retire, let us take a moment to thank them for their many years of service!