Returns open maintenance backlog aging filtered by the given parameters

---
### Parameters
**paramsDict** `Dictionary`<br />
<table class='dictionaryKeyTable'>
	<tbody>
 	<tr><td> - assetPath</td><td>String</td><td>Not required</td></tr>	
 	<tr><td> - maintenanceTypeName</td><td>String</td><td>Not required</td></tr>	
 	<tr><td> - startDate</td><td>DateTime</td><td>Not required</td></tr>	
	</tbody>
</table>

---
### Returns
**backlogAging** `pyDataset`<br />

---
### Example
```python
# Show open backlog aging for the last 90 days, across all assets and maintenance types
paramsDict = {'startDate': system.date.addDays(system.date.now(), -90)}
data = system.kanoa.utilities.convertDatasetToJSON(system.kanoa.cmms.getMaintenanceBacklogAging(paramsDict))

for i, row in enumerate(data):
	print 'Row %i'%i
	for k,v in row.items():
		print k,v
	
	break
>>> 
Row 0
workOrderEventName MWO00047
workOrderPriorityName Low
dueDate 2026-03-14 14:00:01.848
title jjj
ageBucket 31-60
createdDate 2026-03-14 14:01:55.163
assetId None
assetName None
ageDays 46
workOrderEventId 4
maintenanceTypeName Corrective
>>> 
```