You can try something like below.
Oldest Active Ticket =
VAR _active =
COUNTROWS( dates ),
DATESBETWEEN( dates[Date], MIN( Incident[CreatedOn_DateKey] ), TODAY() ),
dates[isWeekend] = FALSE()
KEEPFILTERS( 'Incident'[State Code] = "Active" )
SUMX( _active, [start] )
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