Find oldest/youngest datetime object in a list

I've got a list of datetime objects, and I want to find the oldest or youngest one. Some of these dates might be in the future.

from datetime import datetime

datetime_list = [
    datetime(2009, 10, 12, 10, 10),
    datetime(2010, 10, 12, 10, 10),
    datetime(2010, 10, 12, 10, 10),
    datetime(2011, 10, 12, 10, 10), #future
    datetime(2012, 10, 12, 10, 10), #future
]

What's the most optimal way to do so? I was thinking of comparing datetime.now() to each one of those.