Date of Birth: 
About Sebastián Jahnsen Madico
- Sebastián Jahnsen Madico (born 8 September 1990) is a Peruvian swimmer.
- He was born in Lima.
- He competed at the 2012 Summer Olympics in the men's 200 metre freestyle, finishing 34th fastest in the heats, failing to qualify for the semifinals.
- He also competed in the 50 metre and 100 metre events at the 2013 World Aquatics Championships.
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