TR updates, first round

Author: lpozo

string-concatenation-python/age.py

@@ -1,9 +1,9 @@
 def age_group(age):
-    if age >= 0 and age <= 9:
+    if 0 <= age <= 9:
         result = "a Child!"
-    elif age > 9 and age <= 18:
+    elif 9 < age <= 18:
         result = "an Adolescent!"
-    elif age > 18 and age <= 65:
+    elif 19 < age <= 65:
         result = "an Adult!"
     else:
         result = "a Golden ager!"