Many thing that the universe is like a cosmic oscillator. Banging and crunching across the infinitieth dimension. However, that doesn't change the age of the universe because if it did crunch, then that universe would cease to exist and a new one would bang with perhaps different laws, like different values of G, h or c. Stephen Hawking said that asking about what happened before the Big Bang or what will happen after the Big Crunch is like asking what's south of the south pole. It's a nonsense question. So, the universe is only as old as the Big Bang.

Having said that, it could just be a case of complex time. Like the root of negative one. It may lead to a whole new branch of theoretical physics, which it probably already has in the time it took for the software to actually post this reply.

As for the energy bit, that's very difficult to say given the unpredictability of consecutive universes. Conservation of energy dictates that if the one universe didn't have enough energy to be open, neither would the one after. But since we talking hyper-dimensional, those laws may not, and probably do not, apply. The real question is, does one universe have any effect whatsoever on the one after, or even before it?