diff --git a/web_programming/get_top_billionaires.py b/web_programming/get_top_billionaires.py
index 703b635eef82..d30de63305cf 100644
--- a/web_programming/get_top_billionaires.py
+++ b/web_programming/get_top_billionaires.py
@@ -3,7 +3,8 @@
 This works for some of us but fails for others.
 """
 
-from datetime import UTC, date, datetime
+import doctest
+from datetime import date, datetime, timezone
 
 import requests
 from rich import box
@@ -11,7 +12,7 @@
 from rich import table as rich_table
 
 LIMIT = 10
-TODAY = datetime.now(tz=UTC)
+TODAY = datetime.now(tz=timezone.utc)  # noqa: UP017
 API_URL = (
     "https://www.forbes.com/forbesapi/person/rtb/0/position/true.json"
     "?fields=personName,gender,source,countryOfCitizenship,birthDate,finalWorth"
@@ -44,7 +45,7 @@ def years_old(birth_timestamp: int, today: date | None = None) -> int:
     True
     """
     today = today or TODAY.date()
-    birth_date = datetime.fromtimestamp(birth_timestamp, tz=UTC).date()
+    birth_date = datetime.fromtimestamp(birth_timestamp, tz=timezone.utc).date()  # noqa: UP017
     return (today.year - birth_date.year) - (
         (today.month, today.day) < (birth_date.month, birth_date.day)
     )
@@ -65,7 +66,7 @@ def get_forbes_real_time_billionaires() -> list[dict[str, int | str]]:
             "Country": person["countryOfCitizenship"],
             "Gender": person["gender"],
             "Worth ($)": f"{person['finalWorth'] / 1000:.1f} Billion",
-            "Age": years_old(person["birthDate"]),
+            "Age": str(years_old(person["birthDate"] / 1000)),
         }
         for person in response_json["personList"]["personsLists"]
     ]
@@ -95,4 +96,5 @@ def display_billionaires(forbes_billionaires: list[dict[str, int | str]]) -> Non
 
 
 if __name__ == "__main__":
+    doctest.testmod()
     display_billionaires(get_forbes_real_time_billionaires())