GETTYDuchess of Camrbidge-style short hair can make you look four years young, according to resarch
In a study carried out, into celebrity hairstyles, two-thirds of those surveyed (64 per cent) said that shorter hair had an anti-ageing effect on females.
And over half said that longer hair was harder to take care of whilst poorly maintained hair was one of the biggest ageing factors.
Kate Middleton, 35, stunned the fashion world by unveiling a drastically shorter hairstyle this summer.
The pregnant royal lopped three inches off the length in a new shoulder-skimming cut which was styled in soft, loose curls.
Other female celebrities who have switched from long to shorter hair and looked younger as a result include Taylor Swift, Jennifer Lawrence, Natalie Portman, Anne Hathaway, Jennifer Aniston, Halle Berry, Cheryl Tweedy, Kim Kardashian, Emma Watson and Kirsten Dunst.
GETTYTaylor Swift switched from long to shorter hair and looked younger as a result
Hair is the most important factor in ageing us all. Get your hair right and you can take years off your age
Surgeon Asim Shahmalak - The Crown Clinic
Kate's sister Pippa Middleton has cut her hair shorter too.
The survey of 1,000 people by the Crown Clinic hair transplant centre in Manchester showed 74 per cent of those polled said that it was more difficult to disguise greying hair if you wear it hair long.
The biggest ageing factor of all for women - chosen by 57 per cent of those polled - was grey roots showing up in dyed hair.
The research also found men can shave three years off their age by copying Harry Styles and adopting a shorter cut, too.
Fifty eight per cent said men looked younger with cropped hair too - with man's biggest ageing factor was growing hair long to cover up bald spots.
Harry Styles, 23, radically changed his appearance for the summer blockbuster Dunkirk, chopping off his shoulder-length hair for a spikier, cropped look.
Other male stars who have switched from long to shorter hair in the course of their careers and benefitted by looking younger include George Clooney, David Beckham, Brad Pitt and Zac Efron.
Surgeon Asim Shahmalak of the Crown Clinic said: "Hair is the most important factor in ageing us all. Get your hair right and you can take years off your age.
"This is evident in female style icons like the Duchess of Cambridge who looks younger and fresher with her shorter hair.
"Men can radically change their appearance by updating their hairstyle, too.
"The biggest mistake they can make is going for a comb-over like Bobby Charlton or David Cameron to cover up their baldness.
"Far better to either shave the head like Jason Statham, so people cannot tell just how bald you are, or take the option of increasing number of celebrities such as Calum Best and have a hair transplant."
Dr Shahmalak's other celebrity clients include the Gogglebox star Chris Steed, Homes Under The Hammer presenter Martin Roberts, football pundit Didi Hamann and TV doctor Christian Jessen.
There has been a 40 per cent increase in men seeking hair transplants in the last five years and a key factor has been the 'Rooney effect' with young men in particular following the lead of the former England soccer captain in having a hair transplant.
TOP FIVE FEMALE CELEBRITIES WHO LOOK YOUNGER WITH SHORTER HAIR
1. Duchess of Cambridge
2. Taylor Swift
3. Jennifer Lawrence
4. Anne Hathaway
5. Halle Berry
TOP FIVE FACTORS AGEING WOMEN'S HAIR
1. Grey roots showing through hair dye
2. Over bleaching
3. Dark, one dimensional colour
4. A blunt fringe
5. Fine hair
GETTYHarry Styles looks younger with short hair
TOP FIVE MALE CELEBRITIES WHO LOOK YOUNGER WITH SHORTER HAIR
1. Harry Styles
2. David Beckham
3. George Clooney
4. Brad Pitt
5. Zac Efron
TOP FIVE FACTORS AGEING MEN'S HAIR
1. Growing it longer to cover baldness
2. Grey roots
3. A ponytail
4. Curtain-style longer hair
5. Fine hair