I'm looking for a pow coin that would specifically target older gpu's that were made 2016 and before.
As the other guy in the thread has already mentioned, you can always go to sites like whattomine and check which coin out there is giving the best return at the moment, when you mine it with your old graphic card. That being said, I don't think, that there is a coin out there which is more profitable to mine with a old gpu than with a new one, because that would just not make any sense at all.
Older GPU's simply have a lower hashrate than new ones and this means they are providing less hashpower to the network and therefore also get less rewards per time. You can look for very old projects that are almost not mined anymore, but i would guess that would also not really be profitable, because you won't be able to sell those coins then.