A python question from a beginner

Question

character_name = input("Your name: ")
birth_year = input("Your bith year: ")
current_year = 2022
age = int(current_year) - int(birth_year)

print(character_name + ", you are" + age + "years old.")

Question is: why it doesn't work and how to do it right

Answer 1

The 'age' in the print statement is an integer. You have to first convert it to a string in order to use string concatenation (+), which is different from the addition operator (also +). The difference being the type of operands used:
str + str (string concat)
int + str (syntax error)
int + int (addition)

Try this:
print(character_name + ", you are" + str(age) + "years old.")

Answer 2

As an addition to Serdars solution:
For problems like this Stringtemplates do it:

print(f"{character_name} you are {age} years old.")
the f before the Strings starts the miracle of curly brackets which are replaced by the expression inside.
It is modern and confortable.