Alexander Younger attended Upper Canada College in the 1980s and graduated in 1989. Afterwards, he attended King's College and completed the Canadian Securities Course. In 2005, he married his wife, Sarah Richardson, who is an author, TV host, and interior designer. They have two daughters and live in Toronto. According to an interview on the website Frostsnow, they had been dating for years before their marriage in 2005. Like in most marriages, they welcomed their first child a year later, whom they named Robin. The article goes on to state that their second daughter was born in August 2008. In 1985, Younger worked as a pilot and is now involved in restoring Terminal A at Billy Bishop Toronto City Airport (Toronto Islands). He is also part of the Strategic Advisory Board for the Clearview Aviation Business Park of Collingwood Airport, located north of Toronto.

He was born in Toronto in 1970. According to his biography, his father, Robin Young, was the Executive Vice President and Chief Operating Officer of Dominion Securities, an investment bank that merged with the Royal Bank in 1988. His mother, Patricia Younger, held many volunteer roles, including opening Can Surmont in the 1980s, a program that helps friends and families of cancer patients cope with what lies ahead. His father died of cancer in 1989. His uncle, Michael Wilson, is an ex-federal finance minister of Canada and was the Canadian Ambassador to the United States.

Sarah is an interior design guru and the host of several hit TV shows on HGTV, including Sarah's House, Design Inc., Room Service, and Sarah's Cottage. Alexander Younger is the owner of Design Lab, a boutique interactive agency. They are both sounding boards and collaborate on some projects.

Alexander had known Sarah's older brother since kindergarten and had already had a crush on her. They really started to get to know each other in 1998 when they encountered one another at a Christmas party. Despite meeting occasionally, the two were busy building up their respective businesses and did not go out much. After eight months in a relationship, they decided to go on a 10-day trip, and it was then that they realized they were meant to be together. In an article by Frostnow, Alex talks about his relationship with Sarah and her family. He states, "I've known Sarah's older brother since kindergarten and I've always had a bit of a crush on her. Over the years, we stayed in touch and would go on Victorian-style dates. We'd go roller-blading forever, but somehow we'd never end up going for drinks afterwards...so it was just a lot of exercise." Judging by this quote, it seems that they really enjoy physical activities rather than the typical cliché social dates of getting dinner, going to the movies, and getting drinks at a bar. Their offices are in the same building and they have designed it to reflect the design work environments. Alex's net worth is not recorded, but his wife is estimated to be worth 8 million dollars.