Glaucoma, an eye-related disease among Americans over 50 years old, will become a bigger problem in the near future. The median age of all Americans will likely reach 50 within five years. What does the second sentence do?

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Glaucoma, an eye-related disease among Americans over 50 years old, will become a bigger problem in the near future. The median age of all Americans will likely reach 50 within five years. What does the second sentence do?