Disclaimer: it all belongs to George.
Han and Leia actually met when he was 17 and she was 7, or so in my mind they did. Takes place 12 BBY
Positive
Han tugged at the collar on his stiff Imperial uniform. He was seventeen and fresh out of the Academy. He hated the restriction of the uniform and the rules of serving in the military. Even though he hated being in service to the Empire, it was far better than what he had known as a kid. As a young child his parents had abandoned him and he was picked up by Garris Shrike who had used Han as a punching bag whenever he was drunk. He found salvation two years prior when the Wookiee, Dewlanna, helped him escape the cruel beatings. She had given her life to save the teen, something that Han would never forget.
He had joined the Academy with the hopes of one day being a pilot in the Navy. His entire life all he had wanted to do was to fly. Han's grades were average and when he tested to train as a pilot he missed the mark by only a few points. He would get a second chance in a year but he wanted to fly now. In this time he had been assigned to the medical unit. He was bored there. He drew blood from new recruits and ran the tests. He wanted to get away from Cardia. His chance came when the Emperor had sent out word that he needed medical personnel on a secret mission.
At first it didn't seem like it would be an exciting mission, but at least he wasn't planet bound. They would travel from system to system and run tests on all children around the age of seven of whatever planet they were on. He was testing for something called 'Midichlorians', a term he never heard of during the medical training he received. He was lucky to never run into a child who had these 'Midichlorians' because he soon found why they were searching for these children. One of the senior medical officers had found a boy who tested positive. Han watched in horror as that officer lifted his blaster and shot the boy on the spot. The orders were to kill all children who tested positive. Han knew he could never do that, but he knew that he would have to. It made him sick, the officer told him that he'd get over it.
His life would take a dramatic turn when they entered the system of Alderaan. He watched as the seven year old children were lined up to have their blood tested. He prayed to the Gods that none of these children were positive. Naturally the children were terrified, except for one girl. She was considerably smaller than rest of the children. She looked like a porcelain doll, dressed in white and her hair in double buns. She had large brown eyes that almost seemed too big for her face. She stood in line with her head held high without a hint of fear. When her turn came Han took her tiny hand in his and took her into the examination room.
Han gathered the necessary equipment to draw her blood sample. He explained the procedure to her. She barely winced when the needle pierced her skin and the tube began to fill with blood. He held her arm for a few seconds to make sure the bleeding had stopped before placing a bandage on the site. He mixed the sample and placed it into the machine. The girl seemed to be taking everything in, there was something that different about this girl. She was quiet, most of the other children would try to talk his ears off. A few minutes and passed when the beeping from the machine took his attention off of her. He glanced at the screen ready to see the usual results so he could just send the girl on her way and back to her parents but it was not the results he'd hope to see.
'POSITIVE' the machine read.