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In the scene where Cooper is sending a signal back to his daughter back on Earth, him and the robot are inside the event horizon for a few hours. However after they exit the black hole, it appears that they haven't been subject to time dilation and Cooper is still the same age as Brand.

Why wasn't Cooper affected by spending so much time inside the black hole?

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It's a little slippery, but...

Both Cooper and Brand lost time during the slingshot maneuver, putting them both X number of years forward, to where Murph was an old woman. Then when Cooper entered the tesseract, he was free to maneuver through time and see Murph both when she was young and when she was on the verge of solving the gravity problem. Then, perhaps because it was the last point at which Cooper was outside of the tesseract, he got spat out maybe a year or two after the slingshot maneuver ended. This could be treated as an intelligent choice by the tesseract's controller, as the colony ship was on the verge of entering the wormhole, and Brand was on the verge of establishing the colony.

EDIT: The conceit I'm working on is that the "entrance" to the Tesseract encompassed most of the mass of the black hole, meaning that the amount of time between jettisoning Brand and entering the tesseract didn't cause an immense or insurmountable amount of time loss.

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  • You last paragraph is quite important, since a point that Kip Thorne makes is that they are only very shortly inside the black hole but get transported to the Tesseract (which presumably doesn't exhibit huge time-dilational effects) rather quickly. – Napoleon Wilson♦ Nov 30 '16 at 17:05

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