A physicist, the love and a lost mind

Already with his first words, he underlined his reputation of a hard and always frank lecturer, "I don't intend to remember your names. Not because I'm not able to, but because I don't want to waste any brain capacity. It's needed for more important things I can assure you of this. Most of you will not be able to follow me and the complex subject anyway, so you will soon leave the course."
Full of expectation, Theresa looked directly into the professor's eyes. He was around 6'1' and rather skinny. His curly hair was tamed by a short haircut, which made his narrow face look younger. He was elegantly dressed and 
the professor seemed charming to her. That is he was charming until he opened his mouth.
  "What a nice guy", Theresa thought when he introduced himself.
And here is the story:
After a thirteen-year compulsory break in her academic career, thirty-one years old Theresa Winter resumes her studies in physics and attends a new lecture. She has already heard a great deal about the guest lecturer from Scotland, the famous Professor Peter Calder, and has read all of his work. His cynical demeanour cannot deter her she falls in love with this extremely intelligent man.
But is the age difference too big or is it just "bullshit", as Theresa tells him about his concerns?