Two-way graph using "Separate" and "Collapse"

[Hend She]

Hi all,
I am trying to graph the mean of net transfer per household by age and the foreigner dummy.
Age (age) is defined already and HH net transfer is defined as follows

bysort hid: gen hhgba=(hhcont_tot - hincpubtransfersY)

I expect the two way graph to be similar to this one below. I think one of the ways is using the separate and collapse command for this but I have issues defining it properly. Thank you!

[Hend She]

I forgot to mention that I would like to have it based on weighted data.