[1] When he died, his age of 115 years and 252 days was the longest verified male lifespan at the time, until Jiroemon Kimura surpassed him in 2012.
[2] Mortensen emigrated to Ellis Island[2] in the New York Bay area, the United States in 1903, then aged about 20 or 21 years old.
[2] Mortensen claimed he rode his bicycle to the Aldersly Retirement Community, telling the staff that he was there to stay.
[2] Mortensen was visited by American scientist James Vaupel and other longevity researchers on the occasion of his 113th birthday.
[4] Mortensen was completely blind towards the end of his life and spent much of his time in bed sleeping or in a wheelchair listening to the radio.