Great job Rashid.
Another useful formula which will give u Age in Year, Month, Days.
Formula:
=DATEDIF(B1,TODAY(),"y")&"."&DATEDIF(B1,TODAY(),"y m")&"."&DATEDIF(B1,TODAY(),"md")
Paste this formula in excel sheet in B2 column.
Hope all find it useful.
Regards,
Bhavesh