How to filter and sort according to a preset order in Google Sheets

[jw2022]

I'm wondering how to use the sort and filter function in Google sheets to sort in ascending order the following:

1-2 months
2-3 months
3-4 months
...up to 11-12 months

Right now when I sort 1-2months comes first, followed by 11-12 months.

Is there a simple way to sort these fields according to a preset order?

 

[Fluff]

To sort using a custom order have a look here Sort by Custom Order in Google Sheets [How to Guide]