It's impossible to give a single answer to "how old are organisms" because there's a huge range of lifespans in the living world! Here's a breakdown:

* Individual organisms: Lifespans vary wildly.

* Bacteria: Some can reproduce and die within hours, while others can remain dormant for millennia.

* Insects: Many live for a few weeks or months, but some queen ants can live for decades.

* Plants: Some annual plants live only one season, while bristlecone pines can live for thousands of years.

* Animals: Mice live for a couple of years, while some sea turtles can live for hundreds of years.

* Species: Species themselves have lifespans, often measured in millions of years.

* Evolutionary lineages: The oldest lineages of life on Earth are the bacteria and archaea, dating back billions of years.

To answer your question accurately, you need to be more specific about what you're asking! Tell me:

* What type of organism are you interested in? (e.g., a specific plant, animal, bacteria, etc.)

* Are you asking about the lifespan of an individual, the lifespan of a species, or the age of an evolutionary lineage?

Let me know and I can give you a more precise answer.