Conditions can be combined:

a and b is true only when both are true.
a or b is true when at least one is true.
not a flips true to false and false to true.

age = 15
has_ticket = True
print(age >= 12 and has_ticket)
print(age < 5 or age > 65)
print(not has_ticket)

They are written as words, in lower case. Python also lets you write a range neatly as a chained comparison: 13 <= age <= 19 means the same as age >= 13 and age <= 19.

age = int(input("Age: "))
if 13 <= age <= 19:
    print("Teenager")