Question

does black holes also explode after many many years?
if no what happens to a black hole at its end of life?

Answer 1

Over time they shrink down to nothing and simply pop away in a flash of energy. It's not exactly fast. A good size black hole — say, a few times more massive than the sun — will take about 10^100 years to eventually evaporate through this process, known as Hawking Radiation.