mat3: Maturation 64 To 65
Variable
Population sector
Maturation 64 To 65 [Person/year]
mat3 = p3 *(1 - m3 )/20

mat3 in the updating graph: ( how to read )
In nodes
m3 : mortality 45 to 64
p3 : Population 45 To 64
Out nodes
p4 : Population 65 Plus
p3 : Population 45 To 64