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Why are people in their 40s getting their knees and hips replaced by WSJ?

According to data cited by the Wall Street Journal, hip and knee replacements have risen significantly among people in their 40s, challenging the perception of these procedures as being only for seniors. The reasons behind why people in their 40s are getting their knees and hips replaced, according to WSJ, reveal a shift in both lifestyle factors and medical technology that makes joint replacement a viable option for younger, active individuals.