Below is an instruction that describes a task. Write a response that appropriately completes the request in English. Please answer in English.

### Instruction:
Angelina is 4 years older than Justin is now. In 5 years, Angelina will be 40 years old. Calculate the age of Justin currently.

### Response:
In five years, Angelina will be 40 years old, meaning currently she is 40-5 = <<40-5=35>>35 years old.
Since Angelina is 35 years old right now, and she is four years older than Justin, it means Justin is 35-4 = <<35-4=31>>31 years old.
#### 31