The young have a lot of energy, but little experience, the mature situation is the opposite. And judging by this homemade porn, experience is much more important than the physical conditions: take your time, with feeling, with thought and consideration, the two of you to orgasm! Guaranteed!
The old professor is still so chipper! About his age except that the skin indicates, and so the device works and functions as it should. This was not particularly pleasant for the student, but what can you do, if she did not want to learn. She should have thought about it earlier, or else she had to catch up with everyone else by urgent intake of proteins and proteins from smarter people. It's okay, a semester or two and she'll be up to speed.