I am useless at picking one image. Absolutely rubbish.
I'm going to go with THE SECOND one.
I'll edit this post to say otherwise if I've changed my mind.
Age Changes Us
But I'd also like to add this one to the thread:
My Dad's a Genius
And this one:
Spirals
Which would have been my selection, but I don't feel it's got enough about the stranger in it.