So I bought a 2018 Toyota Camry SE from a dealership. Its about 62k miles now, and 42 when I bought it last year. It's an automatic transmission. It was a certified car. Should I change the transmission fluid now or assume that they changed it and wait 60000 miles?
What does your owner’s manual recommend?
See here for guidance -
https://carkiller.com/scottykilmer/qa/atf/
For piece of mind and if you can’t find any record it was changed (you can’t trust or assume they did it), I would just change it now (drain and fill, and change filter if serviceable) - it essentially becomes like a ‘reset’ and from that point onward stay on top of your transmission ATF intervals, as changing that is (relatively) cheap, but a new transmission is not. When I got my used truck years ago at ~88,000 miles, that’s the first thing I did (fluid was dark red, clean, and shifting fine) and since then been on top of the intervals (every 40,000 miles).
As Scotty has said, on numerous occasions, "certified" means jacksh*t! (A paraphrase).
You can always drain a sample out, and look at the color, see if there's any metal, and smell it.
Assume it has never been drained and filled. I'd either do the service or have it done.
DO NOT HAVE IT FLUSHED! That procedure damages transmissions. Both GM and Honda have, in fact, issued TSBs telling dealers NOT to flush transmission, that flushing voids warranties. Toyota should follow in their footsteps, and do the same.