Mr Kushner, 38, is a senior adviser to his father-in-law US President Donald Trump, as is Ivanka, also 38. Nearly four years ago, Ivanka organised a party for her husband, inviting dozens of powerful and intellectual people, many of whom were much older than they were. According to 2019 book ‘Kushner Inc’, one guest joked that the median age was 70, adding: “It wasn’t a fun party.