I recently married my childhood sweetheart.
That is awesome, did this come out of about by an extension of friendship or physical attraction?
I would say by an extension of friendship. Do most teenage relationships last?
Not really, because it is a transitional stage of physical and psychological development 
I see, so what percentage of high school sweethearts end in divorce?
That is difficult to ascertain due to the nature of such marriages and the dissolution the bonds of matrimony are more variable at that age.
How do childhood sweethearts show affection for each other?
Usually in a more platonic way as they last only a short to medium period of time. 
Do childhood relationships that end ever get rekindled later in life?
Childhood sweetheart
Childhood sweetheart is a reciprocating phrase for a relationship (but not a partnership) between young persons. This may come about by an extension of friendship, physical attraction or develop from natural affinity.
The relationship is usually platonic and lasts a short to medium period of time. This experience forms the basis of subsequent future relationships later in childhood and/or adulthood. Usually, an individual will have no more than one childhood sweetheart as this term is indicative of a milestone in the growth, development and maturity of a
to be an obsession with so many of the Nazis... The casual expressions used by both men in speaking of the Jews were such as to make one cringe, because one would not speak so of even a most degenerate people.
"When I indicated my disbelief in their racial theories, they said what other Nazis had said: 'But surely you, a perfect type of Aryan, could not be unsympathetic to our views'... I had the impression that they really do set unbelievable store by such physical characteristics as