When I hover over the green checkmark in the bottom right corner, it tells me:
"Last received block was generated 54 second(s) ago".
If I go back to it 10 seconds later, it says the same, when I would expect it to say "67 seconds ago" or "1 minute ago".
I guess what the time is telling me is how much time elapsed between the block being generated and the block being received by my client, but that's not what the tooltip says.
"Last received block was generated 54 second(s) before it was received"
or
"Last received block was 54 second(s) old when it was received"
or even just
"Last received block was 54 second(s) old"
would be more accurate. "Ago" means "before now".