The phrase "a certain age where" is correct and usable in written English.
It can be used to refer to a specific stage in life or development, often in discussions about maturity or experiences associated with that age.
Example: "At a certain age where responsibilities increase, many young adults begin to feel the pressure of adulthood."
Alternatives: "a particular age at which" or "an age when".
You do reach a certain age where people assume you to be either dead or senile.
"You reach a certain age where it becomes a lot harder," he said in an interview with The Associated Press.
As the crow flies, the distance from Johnstown, a post-industrial town of a certain age, where Route 30 enters the Adirondack Park, to Malone, where it exits, is only about 130 miles.
"You get to a certain age where you've taken care of your family, you've had your first foray in your career and you start to look outside, and you wake up to your community and the world," said Mr. Fried.
Susan Brandt Baltimore, Nov. 4, 2007 To the Editor: I've been completely annoyed by cellphones on public transit, but I don't need an illegal device; I'm of a "certain age" where I really don't care what anyone else thinks of me, so I just "give something back".
IT used to be that when motorcycle riders reached a certain age where the bike was getting the better of them -- their sense of balance was fading, say, or their legs were starting to go and they found themselves tipping over unexpectedly at stop lights -- they would regretfully hang up their helmets and leather jackets and toddle into four-wheeled retirement.
What do you think is going on?" I think I remember saying to him, "You know that point in your life where you hit a certain age when you realize like the shit you cared about when you were young doesn't matter?" This stupid shit that you held onto, whether Mary Jane likes you -- whatever it was.
Hidden in Newark's beautiful Art Deco Penn Station, we of a certain age know where there is still a "Tubes" bronze sign or two.
OSLO — Nearly all Norwegians of a certain age know where they were when Oddvar Bra suddenly broke his ski pole in the final sprint of a championship ski race in 1982, and Norway had to settle for a tie with the Soviet Union.
Durand et al. (1996), for example, have noted that migradollars (i.e., remittances) of Mexican migrants increase by 4.3% with their years of education until a certain age (40s), where older migrants are less likely to remit.
Even today, Canadians of a certain age can remember exactly where they were when they heard Foster Hewitt's call from Moscow: "Henderson has scored for Canada".
