The phrase "although the age of" is correct and usable in written English.
It can be used to introduce a contrast or exception related to age in a statement or argument.
Example: "Although the age of the building is over a century, it has been well maintained and remains structurally sound."
Alternatives: "despite the age of" or "even though the age of".
Yet although the age of Prohibition now feels very remote, the idea lives on.
Although the age of the dinosaurs lasted about 165 million years, their skeletons are relatively uncommon: only about 3,000 are known to exist.
Although the age of consent in Italy is 14, it is an offence to pay for sex with a prostitute aged under 18.
Although The Age of Revolution started out as a single book, by the time he had finished The Age of Capital in 1975 he realised he was in fact in the middle of a much larger project.
Although the age of Ian Chappell's aphorism that the best coach is the one that takes you to and from the ground has passed, it must be remembered that it is still the players and their captain, not the coach, who win Test matches for Australia.
According to the survey, there are few gender differences, although the age of the respondent in question did make a difference.
(Although in the age of social media, it's no longer clear that exile means irrelevance.
Although at the age of 13 he had a brief nervous breakdown through overwork, he went on to win a distinction at the equivalent of O-level maths.
(Although, in the age of dating apps, not to mention escort services and chat rooms, there are other, less potentially career-ending ways to get some.
Only one company makes it in the United States, and it is primarily sold (under the brand name Right Dress) in the Northeast, although in the age of the Internet everything seems to be available everywhere.
Growing up, we were all supposed to be in the Asterix or Tintin camp, although by the age of eight, thanks to the judicious influence of an older cousin, I was already engrossed in Daredevil and Strontium Dog.
