yes - sounds ridiculous! Who makes up these rules anyway?!
Thought I'd just check the stats though:
In the UK it has been estimated from autopsy studies that approximately 12% of men and 24% of women of all ages have gallstones present.(1) The prevalence in North America is comparable to that in the UK, and it is believed that 10–30% of gallstones become symptomatic.
(1) Garden, O. James. Hepatobiliary and Pancreatic Surgery: A Companion to Specialist Surgical Practice, 4th Edition. W.B. Saunders Company, 112009. <vbk:978-0-7020-3014-7#outline(10.1)>.