Pandas get the age from a date (example: date of birth)

Question

How can I calculate the age of a person (based off the dob column) and add a column to the dataframe with the new value?

dataframe looks like the following:

Answer 1

Use this one liner when you are trying to find the age from date of birth column with current year

import pandas as pd

df["dob"] = pd.to_datetime(data["dob"])

df["age"] = df["dob"].apply(lambda x : (pd.datetime.now().year - x.year))