Finding averages based on selected ID (client)

COYirenkyi

The data I am working is at an asset level (example below) and I would like to find the average of all client ages accurately when looking at any segment of asset.

Client	Account	Asset	Age
Client 1	Acc 1	Sec1	50
Client 1	Acc 1	Sec2	50
Client 1	Acc 2	Sec3	50
Client 1	Acc 2	Sec4	50
Client 1	Acc 2	Sec1	50
Client 1	Acc 2	Sec2	50
Client 2	Acc 1	Sec1	25
Client 2	Acc 1	Sec2	25
Client 2	Acc 1	Sec3	25
Client 2	Acc 1	Sec4	25
Client 3	Acc 2	Sec1	28

So for instance, assuming that asset levels Sec2 and Sec3 are of interest, I would like to be able to know the average client age for the clients who possess these asset (in this case which would be Client1 and Client 2).

Thank you.