That is a bit of a long time. Shimano recommend changing the oil when it becomes discoloured which after a decade it definitely will be. 2 or 3 years of regular use has the oil looking tired, never mind a decade.
SRAM (Avid) recommend a year.
Anything with DOT fluid I would do annually, 5 years on anything with mineral oil (Shimano, Tektro). It costs pennies and takes minutes, so I can see no compelling reason not to do so - if they go wrong they cost pounds and take a lot of time.
Job for tomorrow then, I am real lazy on bike servicing, keep them clean and ride them , seldom service them.