Hi Kirti,
Stock Ageing means how much inventory you are holding at your storage location or from how many day there is no goods movement in these goods.
For example material lying at your client premises from
Material from 0-30 Days Material from 30-60 Days material from 60-120 Days
Material X - 120 Pcs Material Y - 50 Pcs Material Z - 40 Pcs
Standard transaction code MC46
Thanks & regards,
Ankur Chauhan