# GrainCollectionOptions.ClassSpecificCollectionAge

[Type overview](/orleans/docs/api/csharp/microsoft.orleans.runtime/orleans.configuration.graincollectionoptions/) | [Properties](/orleans/docs/api/csharp/microsoft.orleans.runtime/orleans.configuration.graincollectionoptions/properties/)

[Source](https://github.com/dotnet/orleans/blob/e4e752cedecc2976811db49802c7a999b1f1c704/src/Orleans.Runtime/Configuration/Options/GrainCollectionOptions.cs)

```csharp
public Dictionary<string, TimeSpan> ClassSpecificCollectionAge
```

Period of inactivity necessary for a grain to be available for collection and deactivation by grain type.