Life planets orbiting black-holes. Can/Do they really exist?

Well, first things first. It's not likely to have a planet orbiting near a black hole and in significant time dilation because the tidal effects would likely tear anything that close apart. Certainly a planet orbiting a stellar mass black hole would need to be quite far away so as to not be torn apart, so any time dilation would be pretty small.

Around a super-massive black hole, the tidal effects are smaller and a nearish orbit with some measure of time dilation is possible. (see link below for more specifics),

http://physics.stackexchange.com/questions/110044/time-dilation-factor-for-the-circular-orbit-at-3-2-schwarzschild-radius

But a stable planetary orbit, you probably max out at about 20% time dilation and only around a super-massive black hole, where there's only 1 per galaxy. The idea of 1 day to 100 years isn't practical, it's 80 days to 100 days if you're talking about a stable planetary orbit.

and, I'm not sure you'd want to be that close to the black hole in the center of the universe, not because the orbit isn't stable, but because stars are in that orbit too. It might not be a safe place to be.

So, in reality, you'd want a stellar mass black hole and a distant orbit, where the time dilation would be quite small, and in that scenario, yes, life is possible because of tidal energy, so a planet could have liquid surface water and an atmosphere, even if the black hole gave off very little light and heat.

Such a planet in a tidal-energy orbit would probably be tidally locked which would protect the far side from any gamma rays the black hole spits out when it eats, so it would in theory be a good place for life. No significant light source, unless it was a binary system, so, plants would have it harder, but there would be heat.

There's another problem. The creation of black holes tends to blow everything appart in a huge explosion. It's unclear that a planet would survive a black hole's birth, so you might need a captured planet.

Finally, intelligent life . . . we really don't know enough about how common intelligent life is on other planets. Life might be fairly enough, but intelligent life is far less clear and there's other factors than just time.

Today, we simply don't know enough to predict if there's intelligent life out there or not. There probably is life elsewhere in the universe, though even that isn't 100% certain, but intelligent life, there's far too many unknowns in that equation. But I think a black hole might not be optimal for the formation intelligent life because of the lack of light so, much less photosynthesis, so, slower oxygen formation (if it follows the same pattern the earth does) and the unlikeliness that a planet would survive the black hole's creation.