Как выполнить группировку в SQLAlchemy?

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from sqlalchemy import create_engine, Column, Integer, String
from sqlalchemy.orm import sessionmaker
from sqlalchemy.ext.declarative import declarative_base

engine = create_engine('sqlite:///example.db')
Session = sessionmaker(bind=engine)
Base = declarative_base()

class Person(Base):
    __tablename__ = 'people'
    id = Column(Integer, primary_key=True)
    name = Column(String)
    age = Column(Integer)

Base.metadata.create_all(engine)

session = Session()

people = session.query(Person.name, Person.age).group_by(Person.age).all()

for p in people:
    print(p.name, p.age)