Paleovirology seems to work the opposite of the way the Creationist want. The more information we have, the further back the timeline shifts, not vice versa.
For example, we used to think HIV-1 started in humans ~1930, but after we found more ‘old’ HIV sequences, the clock got pushed back to 1902-1921.
After a recent finding in fish, the evolutionary history of retroviruses got pushed back… 400 million years.
They found an endogenous retrovirus in a fishy genome. But not just any ol ERV… a foamy virus ERV. Foamy viruses are complex, and only found in land mammals, thus assumed to be relatively recent inventions of nature.
But here is a foamy virus, plopped in the middle of a fishy genome, itself about 19 million years old.
When they compared the fishy foamy ERV to mammalian foamy viruses, and lots of different kinds of exogenous and endogenous retroviruses, they found:
… the most parsimonious explanation of this phylogenetic pattern is that foamy viruses infecting land mammals originated ultimately from a prehistoric virus circulating in lobe-finned fishes.
… The common ancestor of coelacanths and tetrapods must have existed prior to the earliest known coelacanth fossil, which is 407–409 million years old.
This means that complex retroviruses are at least ~400 million years old (how old are the simple ones??? HA!). They followed us out of the water, and onto the land.
Its like every great event in our evolutionary history, we were walking hand-in-hand with our retroviruses… footprints in the sand…