I think the idea in the verse that David quotes is that the married deacons and elders should show a faithfulness to his spouse. However this does put limit on the marrital status or gender on who is ‘reserved’ to be God’s servant. As Mphatso has put it, the calling is for everyone.
Young and old, married and single, man and woman, all are equally called to be a servant leader.
Source: Daily Sabbath School Lessons