1: "Age concerns arise as Biden's campaign falters"

2: "Harris steps in to take over Biden's faltering campaign"

3: "Biden's age becomes a central issue in campaign"

4: "Harris emerges as a key player in the Democratic race"

5: "Biden's health and age raise doubts among voters"

6: "Harris gains momentum as Biden's campaign struggles"

7: "Age concerns overshadow Biden's messaging"

8: "Harris positioned to lead as Biden's campaign wanes"

9: "Age concerns loom large as Harris takes the reins"