Sarah Clark has been living with arthritis for 10 years - and she's only 32.
Miss Clark, the sports co-ordinator at Golden Sands School, was diagnosed with rheumatoid arthritis after she began getting joint pain mirrored on both hands 10 years ago.
The school is holding a fundraising mufti day on Miss Clark's behalf today to raise money for Arthritis New Zealand. Most of the 340 children will wear orange and be given Arthritis New Zealand merchandise.
Miss Clark said it would come as a surprise to some of the parents that she had arthritis because it was unusual to see the disease in someone so young.
About 530,000 people in New Zealand suffer from arthritis and about 1000 of those are young.