Jarāmaraṇa is a big and complicated word that comes from an ancient language called Pali. It actually means something that happens to all living things: they start to get old and eventually die. Yes, even animals and plants! This is something that is natural and happens to everyone, no matter how much we wish it didn't.
When we say jarāmaraṇa, we are talking about the two main parts of this process. "Jarā" means getting old, and "maraṇa" means dying. So, jarāmaraṇa is just a fancy way of saying that all living things get old and eventually die.
Think about it like a butterfly. At first, it's just a little caterpillar that eats and grows and eats some more. It eventually becomes a beautiful butterfly that flies around and sees the world. But after a while, it gets old and can't fly as well. Then, it dies and becomes part of the earth again.
This is the cycle of life, and it happens to everything. So, when we talk about jarāmaraṇa, we are just reminding ourselves that we should appreciate the time we have and cherish the moments we share with our loved ones, because one day we will all get old and eventually die.