Good Morning Britain fans were gobsmacked when Dr Hilary Jones revealed his age live on TV today.
The veteran doctor has been advising viewers for years, but few of them knew how old he was.
Sitting in the studio this morning - looking dapper in a charcoal suit - Hilary joked: "make-up is amazing these days isn't it" - after revealing he was 70.
A stunned Susanna Reid, 52, wanted to know what his "secret" was as Richard Arnold, 53, asked his colleague how he was feeling about celebrating the milestone.
"I feel great" said Hilary as Stevie Wonder's Happy Birthday played in the background, before adding he was 'looking forward to his next marathon'.
Host Richard Madeley, 67, seemed somewhat shocked by the doctor's age as he said: "You do not look 70 mate" - and viewers agreed.
Flocking to Twitter, many of them praised the GP for looking so young.
One said: "Dr Hilary is 70!!! Still gorgeous Xx #GMB."
Another wrote: "Can't believe Dr Hilary is 70!"
While a third gushed: "Happy Birthday to beloved Doctor Hilary, 70 years today. He has helped so many over the years. God Love Him Xxxxx."
Dr Hilary joined GMB in 2014, transferring from its previous incarnation Daybreak.
Throughout the years he's offered his medical opinion on everything from male pattern baldness to erectile disfunction.
This Men's Health Week, the TV doctor urged men to "get over" the embarrassment of going to the doctor to get themselves help when they need it.
The GP spoke to The Mirror about the biggest health concerns men currently face, which he claims include heart disease, mental health and cancer.
The medical expert explained that mental health has become a major concern for men of late, with suicide being the most common cause of death among men under 45.
"It's shocking, isn't it," he proclaimed.
"But men do bottle up their feelings, they don't talk about their emotions like women are able to do so, and often people don't notice when a guy is seriously anxious or depressed and that's something we need to be more aware of."
Hilary also discussed how heart disease is something doctors are seeing much more of due to "more inactivity and more obesity".
It's a "major problem" he admits.
And the third concern was cancer, which for men, in particular, the big worries are testicular cancer and prostate cancer.
"We don't have a really good prostate screening possibility at the moment, although we're looking into it and we're going to get better at it," Hilary, who is also an adviser to Hada Labo Tokyo Skin Care, explained.
"So many men are reluctant to be investigated for prostate problems. You know they're embarrassed and men need to get over that embarrassment as well."
* Mental Health : *If you are struggling with mental health, you can speak to a trained advisor from Mind mental health charity on 0300 123 3393 or email info@mind.org.uk
