1: Jim Parsons expresses disbelief over Michael Keaton playing older Sheldon in spinoff.

2: Parsons questions casting choice for potential spinoff with Michael Keaton.

3: Actor Jim Parsons doubtful about Michael Keaton as older Sheldon.

4: Parsons surprised by idea of Michael Keaton as older Sheldon in spinoff.

5: Jim Parsons skeptical of Michael Keaton casting in Sheldon spinoff.

6: Parsons shares thoughts on possible Michael Keaton casting in spinoff.

7: Jim Parsons unsure about Michael Keaton playing older Sheldon in spinoff.

8: Parsons comments on potential casting of Michael Keaton in Sheldon spinoff.

9: Jim Parsons doubts Michael Keaton's suitability for older Sheldon role.

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