Airbrush paint, how long does it last in the bottle?

How long does airbrush paint last when it is sealed in the original bottle? I just came across a great deal on some airbrush equipment and paint and I don't know what to do about the paint (and I have an airbrush in the barter pot if someone is interested). I bought a few paint bottles and tried a couple out with no issues but I don't know if I just got lucky or if they will all probably be good.

Hopefully someone with some real world knowledge can give some advice.
Thanks

Sealed, in the original bottle? For an obnoxiously long time.

I highly doubt you'll have any issues with the paint. Give it the good typical shaking required of paint that's settled with time, and you'll see no difference in quality.
The only factor that usually interferes with paints that are still sealed is excessive exposure to heat/cold.

Howdy,
they should last a few years at least. I have a few that I bought in the 90s and they are still quite usable.