To be honest I don't know. I'm changing my car this year and I'm waying up the option of leasing or getting a car loan to purchase the car. I'm in a position now, where i'd like to be able to change my car every 2/3 years. I'd like to have the option of having a relatively new car every few years and with leasing I may be able to do this.
I think that you can lease cars of 1-2 years old provided they are in the more premium end of the market with traditionally better re-sale values such as BMW, Mercedes Benz, Audi etc...