| UPDATED: 21:50, Sun, Jan 17, 2021 Link copied Sign up for FREE now for the biggest moments from morning TV SUBSCRIBE Invalid email When you subscribe we will use the information you provide to send you these newsletters. Sometimes they'll include recommendations for other related newsletters or services we offer. Our Privacy Notice explains more about how we use your data, and your rights. You can unsubscribe at any time. Siobhán McSweeney is most familiar as Sister Michael, the Headmistress of Our Lady Immaculate Girls' School in Channel 4 comedy Derry Girls. Tonight the actress will try her hand at pottery as she appears on The Great Pottery Throw Down but how old is Siobhán?