# PSYS_SRC_MAX_AGE

*LSL constant*

```lsl
integer PSYS_SRC_MAX_AGE = 19;
```

Float parameter specifying the active duration of the particle system in seconds (0.0 means forever).

Constant groups: [ParticleParam](/constants/groups/ParticleParam/)

:::note[Documentation]
This entry is documented in the LSL definitions. No matching wiki article is present in this local collection. Its inclusion here does not establish availability on every simulator.
:::

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From lsl.dev: https://lsl.dev/constants/PSYS_SRC_MAX_AGE/