It’s clarifying that trump isn’t just older than their age when they took office, he’s older than their current age.

alive people don’t pass each other in age

Numerically, yes. But some people age considerably fast in other regards. Prince William and Nicki Minaj are the same age. Beyonce and Elijah Wood? Same age. John Cena and John Oliver. Same.

Depends on the gravity and/or acceleration that they experience in their frame of reference.

It’s all just a play to be able to say when Biden took office, when they don’t on the others. The wording makes it seem like they say the same for all.

Tries to hide the fact that Biden is still older than Trump (which should come as no surprise to anyone)