# Lifetime

> Alive time as a 0-1 value in the X component, and Total Lifetime in the Y component. To get the current particle age, simply multiply X by Y.

## Definition

* **Type:** Field
* **Namespace:** [UnityEngine](/engine/6000.3/script-reference/unityengine.md)
* **Assembly:** UnityEngine.ParticleSystemModule

> **Warning:**
>
> **Deprecated.** ParticleSystemVertexStreams is deprecated. Please use ParticleSystemVertexStream instead.

```csharp
Lifetime = 1024
```