String and List methods

In PCAP Course , under Topic : String and List methods → String actions command is like this as below :
age = 23
print(‘I am’ + str(age) + ‘years old’)

As per video O/P is shown as : I am 23 years old .
But i am getting error as TypeError: ‘str’ object is not callable

Can anyone suggest why ?

The code above is correct. What did you try, because it can’t have been this.