According to Bahraini officials, Kosgei was born on 12 February 1989, in
Kenya. Like fellow Bahraini runners
Belal Mansoor Ali and
Tareq Mubarak Taher, his age is surrounded by controversy. In August 2005, the
IAAF opened an investigation on their ages which was still ongoing . In 2006, Khamis won a bronze medal over
3000 metres at the Asian Indoor Athletics Championships. At the
World Junior Championships in Beijing the same year he won a bronze in
10,000 metres and finished fifth in
5000 metres. The IAAF Council opened an investigatory disciplinary file on Khamis the day after his 5000 m finish. ==References==