Hi Richie,
How about creating one object for 'Status' of both Field1 and Field 2 as below and then create the Custom Navigation Path with Age Bucket and Status objects.
Case
when Field1 = 'Y' then '1At Goal'
when Field1 = 'N' then '1Not at Goal'
when Field2 = 'Y' then '2At Goal'
when Field2 = 'Y' then '2Not at Goal'
else ''
End
Please try to create few variables and check which one works best for you.
Thanks,
Mahboob Mohammed