|2014 Amsterdam||Double sculls|
|2017 Sarasota||Double sculls|
Aldersey was named Olympia by her parents as she was born during the 1992 Barcelona Olympic Games. In 2011, she graduated from St Peter's Girls School. She studies at the University of Adelaide, South Australia.
Club, youth and state rowing
Aldersey rows from the Adelaide Rowing Club.
Aldersley was first selected to represent South Australia at age seventeen in the women's youth eight in 2009 contesting the Bicentennial Cup at the Interstate Regatta within the Australian Rowing Championships. She made three further South Australian youth eight appearances in 2010, 2011 and 2012. In 2010 she also rowed in the South Australian senior women's eight competing for the Queen's Cup at the Interstate Regatta. South Australia didn't enter eights for the Queen's Cup in 2011 or 2012 but in 2014 she was back in the five seat of their senior women's eight and she raced five consecutive further Queen's Cups in from 2014 to 2018.
Aldersey competed as South Australia's single scull representative racing for the Nell Slater Trophy in the Interstate Regatta in 2013, 2017, 2018 and 2019.
International representative rowing
Aldersley first represented Australia internationally in 2010 at the World Rowing Junior Championships in Racice, Czech Republic where she won a bronze medal rowing a double scull with fellow South Australian Emma Basher. They also won silver that year at the Youth Olympic Games in Singapore. 
At the 2014 World Rowing Championships in Amsterdam Aldersey raced in Australia's double scull with Sally Kehoe. They finished third in the final and won the bronze medal. During the preliminary racing Kehoe and Aldersey set a world-record time for 2000m of 6:37.31. This record has stood since.
Aldersey was a member of the Australian women's eight who initially missed qualification for the 2016 Rio Olympics but received a late call up following the Russian drug scandal. WADA had discovered Russian state sponsored drug testing violations and the IOC acted to protect clean athletes and set strict entry guidelines for Russian athletes resulting in most of their rowers and nearly all of their crews being withdrawn from the Olympic regatta. The crew had dispersed two months earlier after their failure to qualify but reconvened, travelled at the last minute to Rio and borrowed a shell. They finished last in their heat, last in the repechage and were eliminated.
Aldersley continued to row at the highest world level into 2017 but moved into a double scull with Madeleine Edmunds. They contested two World Rowing Cups in Europe before winning a bronze at the 2017 World Rowing Championships in Sarasota, Florida. In 2018 at the World Rowing Cup II in Linz, Aldersey was in Australia's women's quad scull which placed third. 
In 2019 Aldersey was picked in Australian women's sweep squad for the international season. In an effort to qualify the women's eight for the 2020 Olympics, selectors made some changes between the coxless four and the eight. Molly Goodman moved into the eight and Aldersey was selected at bow in the Australian women's coxless four. She rowed in that crew to a bronze medal at RWC II in Poznan and to a gold medal at WRC III in Rotterdam.  Aldersey, Werry, Hawe and Stephan were selected to race Australia's coxless four at the 2019 World Rowing Championships in Linz, Austria.
- "Torrens Rowing Club News". News.torrensrowingclub.com. Retrieved 19 November 2017.[permanent dead link]
- "2009 AYOF". Ayof09.olympics.com.au. Archived from the original on 1 March 2011. Retrieved 19 November 2017.
- "2009 Australian Youth Cup Regatta". Rowingaustralia.com.au. Archived from the original on 9 March 2011. Retrieved 19 November 2017.
- 2009 Austn C'ships
- 2015 Austn C'ships
- "Women's Interstate Sculling Championships - Australian Rowing History". Rowinghistory-aus.info. Retrieved 19 November 2017.
- 2017 Austn C'ships
- "Aldersey and Basher Silver - Singapore 2010". Daylife.com. Archived from the original on 18 March 2012. Retrieved 19 November 2017.
- "Archived copy". Archived from the original on 14 November 2011. Retrieved 1 September 2011.CS1 maint: Archived copy as title (link)
- "Archived copy". Archived from the original on 14 August 2010. Retrieved 20 August 2010.CS1 maint: Archived copy as title (link)
- 2016 Olympics at Guerin Foster
- Aldersey at World Rowing
- Aldersey at World Rowing
- 2019 WRC entry list