At what point are you over leveraged?

[Lawrence Moore]

Out of curiousity from my previous post (https://www.biggerpockets.com/forums/311/topics/34...) 

I figured I should ask this. How many properties do you all own fully compared to leverage/finance? Do you believe you can ever over-leverage? Obviously while you're young it is a good thing to do, but I don't think someone who is 65 should have 30 leveraged properties all on their own. 

Any thoughts?