NameError: global name 'age' is not defined

$ ./openerp-nag -f projects --authenticated
Traceback (most recent call last): 0% [ ] ETA: --:--:--
  File "./openerp-nag", line 361, in <module>
    main()
  File "./openerp-nag", line 333, in main
    nags.extend(gen_project_nags(lp, policy, project_name))
  File "./openerp-nag", line 176, in gen_project_nags
    for nag in gen_merge_proposal_nags(lp, policy, project):
  File "./openerp-nag", line 219, in gen_merge_proposal_nags
    age >= policy.days_before_merge)):
NameError: global name 'age' is not defined