Adding Dynamic Vertical reference line to Barchart

Hi All, 

My dataset is as below.

Where Result type is Legend, Forecasted Age is coming from forecasted data and it will be always ranging from 3-60. Age - Current  in Month is the actual age which will be dynamic based on the selection of the filter. The bar represents Sum of Qty for each Result Type. So chart will look like below.

This is the current chart

Now I want to add a reference line which will represnt the column 'Age - Current  in Month' and bar graph should show like this.

This is the expected chart

Please help me to resolve this issue.

Thanks,

Rajesh S Hegde