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I have some paints that I've had for at least 10 years or better that are as good now as they were the day I bought them. If the container hasn't been opened it'll be good for a very long time as long as you don't let it freeze or get too hot.
Oil based in containers other than what they came in I usually take a teaspoon and add either a little Penetrol to cover the paints surface or boiled linseed oil, just pour it off before you use it and you're good to go. Latex is the same but I take a sponge and cut it to the size of the container, I then push it in and get it seated on the paints surface and then add water to expand the sponge, when you want to use the paint just pull the sponge out of the container and it's good to go.
Hope this helps.
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