Last year, when Prince Johan Friso, 35, third in line for the throne of the Netherlands, announced his engagement to Mabel Wisse Smit, 35, the head of a Brussels-based human rights organization.

• 去年，35岁的荷兰王子约翰·弗里索（排序第三的王位继承人）宣布与设在布鲁塞尔的人权组织负责人，同样35岁的马伯尔·维斯·斯密特订婚时，