[osteoftex]

The proper rule is x/10 +7:

http://www.digitaljournal.com/article/281223

A Somali man, 100, married a 17-year-old girl in front of hundreds of guests on Tuesday. The man's family supports the marriage.
On Tuesday in Somalia, Ahmed Mohamed Dhore, who claims to be a centenarian, married a girl that is young enough to be his great great granddaughter in front of hundreds of guests, according to the Associated Press. This may be a shock in the Western world but it is quite common for young girls to marry much older men but, most often, not that old.
Dhore said he wanted to marry Safiya Abdulle for a long time but he wanted to wait for her to grow up. The possible centenarian told the media that his children, his parents and two other wives supported the marriage.
This is the sixth marriage for Dhore and three of his wives have died reports the Toronto Sun.
The London Free Press stated that it’s not possible to verify Dhore’s age.
Polygamy is a common occurrence in Muslim Somalia.