Hip replacement surgery is being offered to younger people with arthritic hips. However, there is an increased risk of revision surgery if you are younger the 55 years old when your hip is replaced. There is good research evidence that weight loss, exercise and physiotherapy can help reduce the need for surgery by controlling the symptoms associated with arthritis. Unfortunately, getting a good result from exercise and physiotherapy can take a number of sessions to achieve. This is often more than is offered by NHS physiotherapy. Long term management of arthritic hips with physiotherapy and exercise can be a valid alternative to hip joint replacement until the symptoms and your lifestyle are more severe affected.
There is an excellent review of this on the Chartered Society of Physiotherapy website.