Hi Uma,
you need to create two formula's to achieve your desired output.
Formula 1
- Create formula 1 using key figure "aging" and goto calculation tab -->choose cumulated option (under Calculate single value as)..
- hide this formula
Formula 2
- create formula 2 using formula 1 and choose result(SUMCT) from date functions in operators
- goto calculation tab -->choose Maximum option from Calculate single value as