The current Duchess of Northumberland, Isobel Jane (Jane) Percy, was born on 11 May 1958, which makes her 67 years old as of 2026.

Quick Scoop: How old is the Duchess of Northumberland?

  • Full name: Isobel Jane Percy (née Richard, often known as Jane Percy).
  • Title: Duchess of Northumberland, as the wife of Ralph Percy, 12th Duke of Northumberland.
  • Date of birth: 11 May 1958.
  • Age now: 67 years old (she turned 67 in May 2025 and will turn 68 in May 2026).

There have been several Duchesses of Northumberland across history, but when people ask “how old is the Duchess of Northumberland” today, they almost always mean the present title-holder, Jane Percy, known for her work on Alnwick Garden and the famous Poison Garden at Alnwick Castle.

Information gathered from public forums or data available on the internet and portrayed here.