How old is Louis Partridge? This image appears in the gallery:Louis Partridge: 13 facts about the Enola Holmes actor you need to know 2. How old is Louis Partridge? Louis Partridge was born June 3rd 2003, making him 19 years old. [via Instagram] 14 images See the full gallery: Louis Partridge: 13 facts about the Enola Holmes actor you need to know