How do I calculate the duration between two date in Years and months (not days) in Power Query

[EmmaDilemma]

How do I calculate the duration between two dates in Years and/or months (not days) in Power Query   

I need to insert a column which will show the age of the customer when they purchased their product.  I have their date of birth and the transaction date - I need to report on the age of customer at transation date in Years.

Thanks in advance

[EmmaDilemma]

this is great James - I will give it a try now - Im assuming I go to powerquery - add column - custom column ?

[JamesRobson]

Yea thats correct, let me know if you get stuck and I can add screenshots.

Thanks,

[JamesRobson]

Hi,

 Give this a go (assumed coumns are called Birth and Purchase)

= Table.AddColumn(#"Changed Type", "Years", each Duration.Days([Purchase] - [Birth])/365, type number)

Thanks,

[JamesRobson · Accepted solution]

I was being lazy and forgtot to round decimal places....

= Table.AddColumn(#"Changed Type", "Years", each Number.Round(Duration.Days([Purchase] - [Birth])/365,2), type number)