I'm not sure I understand your question, but if you mean what age, it can start at any age.
The autoimmune type of arthritis can start in infancy; my mother was just diagnosed at age 79.
The wear and tear type of arthritis, osteoarthritis, is associated with old age but again, if someone is born with a joint deformity or suffers a joint injury at a young age, osteoarthritis can set in very early - teens, young adult, etc.
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