diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 60c1d6d11..1631feb2b 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -10,7 +10,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
-      - uses: actions/setup-python@v4
+      - uses: actions/setup-python@v5
         with:
           python-version: 3.12
           allow-prereleases: true
diff --git a/web_programming/get_top_billionaires.py b/web_programming/get_top_billionaires.py
index 6f986acb9..703b635ee 100644
--- a/web_programming/get_top_billionaires.py
+++ b/web_programming/get_top_billionaires.py
@@ -3,7 +3,7 @@ CAUTION: You may get a json.decoding error.
 This works for some of us but fails for others.
 """
 
-from datetime import UTC, datetime, timedelta
+from datetime import UTC, date, datetime
 
 import requests
 from rich import box
@@ -11,8 +11,7 @@ from rich import console as rich_console
 from rich import table as rich_table
 
 LIMIT = 10
-TODAY = datetime.now()
-
+TODAY = datetime.now(tz=UTC)
 API_URL = (
     "https://www.forbes.com/forbesapi/person/rtb/0/position/true.json"
     "?fields=personName,gender,source,countryOfCitizenship,birthDate,finalWorth"
@@ -20,40 +19,40 @@ API_URL = (
 )
 
 
-def calculate_age(unix_date: float) -> str:
-    """Calculates age from given unix time format.
+def years_old(birth_timestamp: int, today: date | None = None) -> int:
+    """
+    Calculate the age in years based on the given birth date.  Only the year, month,
+    and day are used in the calculation.  The time of day is ignored.
+
+    Args:
+        birth_timestamp: The date of birth.
+        today: (useful for writing tests) or if None then datetime.date.today().
 
     Returns:
-        Age as string
+        int: The age in years.
 
-    >>> from datetime import datetime, UTC
-    >>> years_since_create = datetime.now(tz=UTC).year - 2022
-    >>> int(calculate_age(-657244800000)) - years_since_create
-    73
-    >>> int(calculate_age(46915200000)) - years_since_create
-    51
+    Examples:
+    >>> today = date(2024, 1, 12)
+    >>> years_old(birth_timestamp=datetime(1959, 11, 20).timestamp(), today=today)
+    64
+    >>> years_old(birth_timestamp=datetime(1970, 2, 13).timestamp(), today=today)
+    53
+    >>> all(
+    ...     years_old(datetime(today.year - i, 1, 12).timestamp(), today=today) == i
+    ...     for i in range(1, 111)
+    ... )
+    True
     """
-    # Convert date from milliseconds to seconds
-    unix_date /= 1000
-
-    if unix_date < 0:
-        # Handle timestamp before epoch
-        epoch = datetime.fromtimestamp(0, tz=UTC)
-        seconds_since_epoch = (datetime.now(tz=UTC) - epoch).seconds
-        birthdate = (
-            epoch - timedelta(seconds=abs(unix_date) - seconds_since_epoch)
-        ).date()
-    else:
-        birthdate = datetime.fromtimestamp(unix_date, tz=UTC).date()
-    return str(
-        TODAY.year
-        - birthdate.year
-        - ((TODAY.month, TODAY.day) < (birthdate.month, birthdate.day))
+    today = today or TODAY.date()
+    birth_date = datetime.fromtimestamp(birth_timestamp, tz=UTC).date()
+    return (today.year - birth_date.year) - (
+        (today.month, today.day) < (birth_date.month, birth_date.day)
     )
 
 
-def get_forbes_real_time_billionaires() -> list[dict[str, str]]:
-    """Get top 10 realtime billionaires using forbes API.
+def get_forbes_real_time_billionaires() -> list[dict[str, int | str]]:
+    """
+    Get the top 10 real-time billionaires using Forbes API.
 
     Returns:
         List of top 10 realtime billionaires data.
@@ -66,21 +65,22 @@ def get_forbes_real_time_billionaires() -> list[dict[str, str]]:
             "Country": person["countryOfCitizenship"],
             "Gender": person["gender"],
             "Worth ($)": f"{person['finalWorth'] / 1000:.1f} Billion",
-            "Age": calculate_age(person["birthDate"]),
+            "Age": years_old(person["birthDate"]),
         }
         for person in response_json["personList"]["personsLists"]
     ]
 
 
-def display_billionaires(forbes_billionaires: list[dict[str, str]]) -> None:
-    """Display Forbes real time billionaires in a rich table.
+def display_billionaires(forbes_billionaires: list[dict[str, int | str]]) -> None:
+    """
+    Display Forbes real-time billionaires in a rich table.
 
     Args:
-        forbes_billionaires (list): Forbes top 10 real time billionaires
+        forbes_billionaires (list): Forbes top 10 real-time billionaires
     """
 
     table = rich_table.Table(
-        title=f"Forbes Top {LIMIT} Real Time Billionaires at {TODAY:%Y-%m-%d %H:%M}",
+        title=f"Forbes Top {LIMIT} Real-Time Billionaires at {TODAY:%Y-%m-%d %H:%M}",
         style="green",
         highlight=True,
         box=box.SQUARE,