Old galaxies, like most astronomical objects, can still exist over time. Galaxies are vast systems of stars, gas, and dust held together by gravity. They have long lifespans, typically measured in billions of years. While individual stars within a galaxy may undergo various stages of evolution and eventually die, the galaxy as a whole can persist for extended periods.
Galaxies can evolve and change their appearance over time through processes such as mergers with other galaxies, interactions with nearby objects, and the formation of new stars. However, the fundamental structure and existence of a galaxy usually persist, albeit with some transformations.
It's worth noting that the universe itself is continually expanding, and galaxies are moving away from each other due to the overall expansion of space. This expansion can affect our ability to observe very distant galaxies, as their light may be redshifted and become more difficult to detect. Nonetheless, many old galaxies are still observable, and astronomers study them to gain insights into the history and evolution of the universe.