I have a '99 V6 ATX with right around 100K miles.
I bought the car new and have changed the ATF regularly
starting at around 50K miles. No cooler though.
I'm not particularly easy on
the car but I don't beat it either.
The tranny is starting to go and I'm guessing it will be
in the shop for a rebuild before the next 1000 miles
get added to the odometer.
From the threads I've been reading in the forum, 100,000
miles is about the average life expectancy.

But I have to say that the car runs, rides and handles
like the day I drove it home from the dealer.
Normally I wouldn't make an expensive repair investment
in a car with 100K miles on it but I'm seriously considering
it given how well the rest of the car has held up.

Good luck with your car search.
chenz