OK. I agree with some of you right off the bat. What’s a 70-year-old guy doing giving advice about dating and courtship? In words made famous by the man we now call president, “Come on, man!” Agreed in part. I am “old, and grey, and full of sleep,” as the poet Yeats once wrote of a former heartthrob, and though I’m not yet King Lear doddering through a wilderness of memories, I am well on my way. On the other hand, I’ve been around the block a few times, I’ve got one foot in the past and one in the present, and like a lot of codgers my age, I’m always ready to shoot out suggestions to the younger set, though to be frank, they rarely ask me about anything of import. Anyway, let’s look at the dating game. Then It’s early March 1976, and I’m sitting in the Harvard …