JEDDAH, Saudi Arabia (Reuters) – Saudi Arabia’s state human rights body has hired a lawyer to review the case of a girl whose mother sought her divorce from an 80-year-old man, a move activists hope is a first step against child marriage.

Saudi Arabia, a patriarchal society that applies an austere version of Sunni Islam, has no minimum legal age for marriage. Fathers are granted guardianship over their daughters, giving them control over who their daughters marry and when.

The girl — believed to be 12 years old — from Buraidah, a conservative town near the capital Riyadh, was married to her father’s elderly cousin late last year for bridal money of 85,000 riyals ($23,000), lawyer Sultan bin Zahim said.

Activists see the divorce proceedings as a test case that could pave the way for introducing a minimum age for marriage in the kingdom, where child marriage is common in poorer tribal areas.

The child’s mother had earlier filed for divorce on her daughter’s behalf but withdrew without giving a reason after a second court hearing in early February, Zahim told Reuters.