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The lower age limit was chosen for logistic (census enrolment with limited research staff) and statistical considerations (group homogeneity).
Apart from the lower age limit, the studies are identical and we include patients aged ⩾70 in this paper.
The lower age limit is 50, but the rule is flexible.
Most hire car companies won't rent to the over-70s, with some setting an even lower age limit.
The researchers added that it was "disturbing" that there is not a lower age limit for the surgery.
Among the 13 others on the tour that day were families with children who I'm sure were pushing the lower age limit of 10.
Until 2004, the lower age limit had been 20, but this was raised in line with advice from the World Health Organisation.
"The absence of a lower age limit for any of the FGCS procedures is most disturbing of all," the authors wrote.
Soccer has no upper or lower age limit, and in Bolivia there is a marvellous academy, Tahuichi, that weans street children off drugs by introducing them to the sport.
Arne Ljunqvist, who heads the IOC's medical commission, said he has contacted the Fédération Internationale de Gymnastique about the issue of enforcing the lower age limit in the sport.
Every decade since 1983, Granta has produced its 20-strong list of 20- and 30-somethings (although there's no lower age limit, I don't believe a teenager has ever been included).
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com