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In 1998, Pearlmutter announced a supernova that exploded 10 billion years ago and that was estimated to be 18 billion light years away. There must be a lot of dark energy acceleration at work to push it that far away, since light speed would limit things in the Universe to being 13 billion light years apart otherwise. The greater the acceleration, the larger the estimate should become, as far as I know.

announced a supernova that exploded 10 billion years ago and that was estimated to be 18 billion light years away.

Is it 18 giga-lightyears away now, or was it 18 giga-lightyears away when it exploded?

The greater the acceleration, the larger the estimate should become, as far as I know.

This was discussed in the press conference today.

The greater the "repulsive" effect (dark energy?), the older the Universe is, relative to the age that would be acertained by the Hubble parameter alone.

The example given in the press conference was that based only on Hubble expansion observations (no repulsion/accelerating expansion effect), the age of the Universe would be about 9 billion years. When they factored in the repulsive effects on expansion, the result was about 14 billion years, which coincidentaly, is almost exactly the figure that these scientists came up with using the completely independent white dwarf cooling model methodology.