There are times when I crave the foreplay and other times when I want to get to it. I would say if I could always have it the way I want I will go for the foreplay.
Sometimes takes more foreplay to get me ready, but also depends on how tired I am. Being older certainly takes a toll, but the "little blue pill" is the great equalizer when I want to ensure that I'll be ready!
Depends on how long it has been, how I'm feeling (tired, etc), and probably a bunch of other factors. Age certainly has something to do with it also. I used to be ready to go instantaneously. Now, sometimes I am, others not.