As Daigga said, the long claws indicate male - also the relatively small size for an adult Trachemys. I'm not the best at turtles - especially old, stained/dirty ones - so I relied on my favorite online identification references for all things turtle:
http://www.austinsturtlepage.com/world_of_turtles/
This picture reference is great in that it shows many pictures of each species so you can browse around and get a feel for each one.
I'm going with Trachemys scripta elegans, red eared slider, on this one.
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