Hi,

When Outlook keeps shut down, there can be many possible reasons towards this that include: bad PST files, Oversized PST files, unnecessary Add-Ins issues, etc.
As I understood you've already tried running Inbox repair tool but sometimes this won’t resolved your problem. Try disabling Add-Ins but first start your computer in safe mode.

Here are few steps, you need to follow:

Click Start >> in the search box, type Run
In the Run command box, type outlook.exe /safe (maintaining the gap between outlook.exe and /safe) to open your Outlook in safe mode.

When Outlook is opened in safe mode, follow the below steps to disable Add-Ins:

Start Outlook >> click File >> click Options
Click Add-Ins >> Add-in Options...
Navigate to COM Add-ins >> click Go...
Uncheck all the boxes to deselect Add-Ins >> click OK.

Archive is a feature in Outlook that helps to store the unused PST emails that you don’t need for a longer time. There are two types: Auto Archive and Manually Archive. It provides an option to filter emails to move them into archive folder. Like date wise, year wise. Like you said that you want to archive your emails that are older than one year.
Follow these steps to move all the emails that are older than a year into Archive folder:

Start Outlook >> click Tools >> click other >> click on “AutoArchive”
Navigate clean out items older than and set them to value 12 Months and click OK.

Thanks & Regards
Anjlua