'Old age is not for sissies'

Supermodel Iman marked her 60th birthday today with a series of fierce Instagram snaps.

The flawless fashion icon posted the pictures of herself using the hashtag #Iman60 in a bid to redefine beauty standards.

They were uploaded alongside powerful inspirational sayings, including 'sometimes the king is a queen' and 'old age is not for sissies'. 

One touching image was of the Somalian model as a young girl dressed in white, with the message: 'Trust your journey.'

Another saw the mother-of-two, who is married to David Bowie, dressed in a leather top and black and white trousers for one of her many professional shoots.

A quote posted alongside the picture read: 'Trust the timing of your life.'  

The posts come after the businesswoman told Yahoo! Style she's never believed age is a limit.

She said: 'On my 50th birthday in 2005, my discount-wielding AARP card came in the mail. I hurled it in the trash, put on something fabulous, and had a decadent meal.

'Just the thought of putting it in my wallet felt like a concession.

'I'm 60 today. I have laugh lines—not wrinkles. I walk slowly because I am finally in a place where I don't have to rush from one place to the next.'