President Joe Biden mocked his age and lengthy civil career on Monday, a clear attempt to undermine the core argument against him by former President Donald Trump and Republicans heading into the 2024 general election.

Biden’s remarks, at his first stop on a packed campaign slate throughout the week, came just days after his 2024 State of the Union. Democrats have pointed to those remarks as clear evidence Biden, at 81 years old, can still perform the duties of office.