It's to avoid defamation claims from someone of the same name. If they say who, what age, where they live, then the story is less likely to be mistaken as being about someone else of same name. They do mention men's age too.
My Dad featured in an article in the Daily Mail back in the 1990s, after an armed robber held up the bank he worked in. They rang him for an interview, which he was happy to give. They asked him his age though, and he refused to give it, saying he didn't really feel that was relevant. They printed the story with a completely made up age for him... he was fuming.
DP was in a paper before I met him, and it claimed he was a father of two. He had no kids. That must have been an awkward conversation with his wife at the time! Also, it was in the Daily Record, and he's not Scottish and the story was about his appearance on Mastermind, so really not relevant to Scotland in any way, at least not enough to warrant an article!
I always have a chuckle at this. Some go so far as to write a woman's age, hair colour, proffesion and phisique. eg "Blonde hairdresser Michelle, 34". or "Busty lawer Sophie, 28" says confused brunette roly-poly mum, Cranky, 29.