We've been doing some more research at Crown Clinic. We thought it would be fun to look at how our favourite celebrities are ageing and who looks the best as the years roll on. We specifically asked which stars looked youngest in the way they dressed and wore their hair.
The findings were fascinating - with Lulu winning the female poll and Paul McCartney wearing the male poll.
Lulu real age is 66 but she dresses like a 38-year-old - a difference of 28 years; Macca's real age is 72 but his dress age is 48 - a 24 year difference.
What was particularly interesting to us was that not a single male celebrity in the male top ten was showing any significant signs of male pattern baldness.
It shows again that stars can significantly prolong their careers if they can keep hold of their hair. Some are lucky enough to do this naturally while others benefit from a FUE or a FUT hair transplant.
Here are the full findings of the poll, with analysis from our surgeon Asim Shahmalak. We expect the poll to be featured in the media over the next few days.
Lulu tops a new poll to find the star who dresses years younger than her real age. The singer is 66 but dresses like a 38-year-old - giving her a gap of 28 years
* Joan Collins came second - she is 81 but dresses like she is 55, a gap of 26 years.
* Anne Robinson came third with a real age of 70 and a dress age of 51
* Paul McCartney topped the male section - his real age is 72 and his dress age is 48.
Lulu is the world's most ever-green female celebrity, according to a new poll which looked at the difference between stars' real ages and the age at which they dress.
The singer's real age is 66 but she dresses like a woman of 38 - giving her a difference of 28 years.
Joan Collins came second - she is 81 but dresses like she is a 55-year-old, a gap of 26 years.
In third place was Weakest Link presenter Anne Robinson - whose real age is 70 and whose dress age is 51.
Paul McCartney topped the male section with a difference of 24 years between his real age of 72 and the age he dresses - 48.
In second place was Johnny Depp who has a real age of 51 and dresses like a 29-year-old - a difference of 22 years.
Third place went to 72-year-old Harrison Ford, who dresses like a man of 54, 18 years younger than his real age
The survey of 1,000 people was carried out by Crown Clinic, Britain's leading hair transplant centre.
A panel was asked to gauge which stars showed the biggest difference between their real ages and the age they dressed.
The poll found found that 82% people believe that it was possible to look younger than your real age by the way you dress.
However, 42% of people also said that wearing inappropriate clothing can also ADD years to your real age.
The biggest single factor which aged a celebrity of either sex was greying hair, chosen by 78% of respondents.
Other factors which aged stars were wrinkles (69%), being overweight (57%), lined hands (54%), and hair loss (52%).
Fourth place in the female poll went to Sigourney Weaver - with a real age of 65 and a dress age of 47, a gap of 18 years.
Elle Macpherson was fifth with a difference of 17 years between her real age of 51 and her dress age of 34.
Fourth place in the male poll went to Brad Pitt, who is 51 but dresses like a 34-year-old. Fifth place went to Mick Jagger, whose real age is 71 and his dress age is 55.
Hair transplant surgeon Asim Shahmalak said: "Lulu looks incredible - it is staggering that she is six years over the legal retirement age for a woman in Britain.
"Similarly Paul McCartney is a wonderful advert for great styling - we all know he dyes his hair but he does it brilliantly and looks decades younger than his real age.
"What is very clear from this poll is that nothing ages a star quicker than their hair.
"None of the top 10 women and a few of the men have grey hair, and all the men show no appreciable signs of baldness.
"The message is clear: if you want to stay at the top, look after your hair."
Dr Shahmalak is Britain's hair transplant surgeon to the stars.
His clients include the Dr Christian Jessen, presenter of the Channel 4 medical show Embarrassing Bodies, and Calum Best from Celebrity Big Brother.
Real Age Dress Age Difference
1 Lulu 66 38 28
2 Joan Collins 81 55 26
3 Anne Robinson 70 51 19
4 Sigourney Weaver 65 47 18
5 Elle Macpherson 51 34 17
6 Carole Vorderman 54 38 16
7 Demi Moore 52 37 15
8 Sandra Bullock 50 37 13
9 Amanda Holden 44 34 10
10 Halle Berry 48 39 9
Real Age Dress Age Difference
1 Paul McCartney 72 48 24
2 Johnny Depp 51 29 22
3 Harrison Ford 72 54 18
4 Brad Pitt 51 34 17
5 Mick Jagger 71 55 16
6 Tom Cruise 52 37 15
7 Keith Richard 71 57 14
8 David Beckham 40 30 10
9 Rob Lowe 51 42 9
10 Ewan McGregor 44 36 8