The phrase "age-old trick" is correct and usable in written English.
It can be used to refer to a method or tactic that has been used for a long time and is often considered clever or cunning.
Example: "He used an age-old trick to win the game, one that had been passed down through generations."
Alternatives: "time-honored tactic" or "ancient ruse."
Perhaps it was these two brothers in 12th-century France who devised the age-old trick of informing parents of all the great progress being made before making their demands?: To their very dear and respectable parents M. Matre, knight, and M. his wife, M. and S., their sons, send greetings and filial obedience.
When the centre-left pulled off its age-old trick of snatching victory from the jaws of defeat in this year's general election, it was clear to everyone that dynamic new leadership was essential for a party that promises much, but delivers very little.
Sweet fruit or vegetables are one age-old trick: sliced and quickly fried liver (it should be brown on the outside and only slightly pink in the middle) will always be happy alongside caramelised apple, poached quince, roast beetroot or salty parsnip crisps.
In a video that has been viewed over 4.5 million times since it was uploaded on 9 September, youngsters – aged between 15 and 19 – struggled to plug the NES in and boot it up, before they were advised of the age-old trick of blowing on the game cartridge to remove all the dust, spider webs and general debris that might be nestling in there.
Jack Daniels alleges that Lonehand's marketing strategy employs the age-old trick (my description, not theirs) to have retailers display their product adjacent to Jack Daniel's, and to use white on black lettering reminiscent of the Jack Daniel's label.
For an app that's really just a value-add service for Squarespace's main business, this is a really well-thought out and executed piece of mobile software, and a handy replacement for the age-old trick of emailing yourself anytime you're struck by a sudden flash of genius.
This came with age-old tricks plied by higher education hucksters and shysters.
As the story plays out, age-old tricks are played with up-to-date toys.
A magician or two will baffle the audience with age-old tricks involving cards, handkerchiefs, eggs and so forth.
The age-old tricks of the font designers finish the job of providing clear easy comfortable reading.
At the same time, age-old tricks, which may have lost some of their sting over the years, now have renewed potency, detectives say.
