added lower higher age eligibility

policyengine_canada/parameters/gov/provinces/ab/tax/income/credits/credits_return/higher_age_eligibility.yaml

@@ -0,0 +1,13 @@
+description: Alberta limits its Child and Family Benefit to people above this age (who are not disabled).
+values:
+  2022-01-01: 65
+metadata:
+  unit: year
+  label: Alberta child and Family Benefit adult dependant age eligibility
+  reference:
+  - title: Province of Alberta - Alberta Child and Family Benefit (2022)
+    href: https://www.canada.ca/content/dam/cra-arc/formspubs/pbg/td1ab/td1ab-22e.pdf#page=1
+  - title: Province of Alberta - Alberta Child and Family Benefit (2023)
+    href: https://www.canada.ca/content/dam/cra-arc/formspubs/pbg/td1ab/td1ab-23e.pdf#page=1
+  - title: Province of Alberta - Alberta Personal Income Tax Act, RSA 2000, Division 4
+    href: https://www.canlii.org/en/ab/laws/stat/rsa-2000-c-a-30/latest/rsa-2000-c-a-30.html

policyengine_canada/parameters/gov/provinces/ab/tax/income/credits/credits_return/age_eligibility.yaml → policyengine_canada/parameters/gov/provinces/ab/tax/income/credits/credits_return/lower_age_eligibility.yaml

@@ -1,4 +1,4 @@
-description: Alberta limits its Child and Family Benefit to people above this age.
+description: Alberta limits its Child and Family Benefit to people above this age and disabled.
 values:
   2022-01-01: 18
 metadata:

policyengine_canada/variables/gov/provinces/ab/tax/credits_return/ab_caregiver_amount.py

@@ -17,9 +17,9 @@ def formula(person, period, parameters):
 
         # Whether the person is dependant (65 or older/ disabled)
         age = person("age", period)
-        is_dependant = (age >= 65) | (
+        is_dependant = (age >= p.higher_age_eligiblity) | (
             person("age", period)
-            >= p.age_eligibility & person("is_disabled", period)
+            >= p.lower_age_eligibility & person("is_disabled", period)
         )
         dependant_net_income = (
             person("individual_net_income", period) * is_dependant