Create app.py

app.py

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+import streamlit as st
+from datetime import date
+
+st.set_page_config(page_title="Age Calculator", layout="centered")
+st.title("🎂 Age Calculator")
+st.subheader("Calculate your age from your date of birth")
+
+dob = st.date_input("📅 Select your Date of Birth", value=date(2000, 1, 1))
+calculate = st.button("🔢 Calculate Age")
+clear = st.button("🗑️ Clear")
+
+if calculate:
+    today = date.today()
+    age_years = today.year - dob.year - ((today.month, today.day) < (dob.month, dob.day))
+    st.success(f"🎉 You are {age_years} years old!")
+
+if clear:
+    st.experimental_rerun()