Codie is almost 3 years old, Tia is almost 2 years old and Cali is almost 1 year old.
They all have free run of my kitchen, dining room and hallway (it's all tile). They are fully potty trained and well behaved. I just don't feel like they "need" access to the bedroom, bathroom and living room -- so I keep all those doors closed.

They have PLENTY of space to run and play all day, even though they pretty much just sleep!