^At 83yo, he is currently the oldest and one of the longest serving justices on the bench and, unfortunately, one of the few remaining who are not staunchly conservative.
If the Ds don't move fast they may at best end up in a situation where their nominee is blocked, like what happened with Garland, and at worst end up in situation where Breyer dies on the bench like RBG.
I feel like there's not been enough alarm about this predicament, with everything else going on. The SCOTUS conservative majority is already a concern, but if the Ds allow the margin to GROW after this period that they controlled Congress and the Exec branch..? Smh that would be pure ineptitude. Especially after watching the Rs be so ruthless with the Judiciary branch in recent years.