United Kingdom, April 17 -- Christie Brinkley vowed not to be "defined" by her age after she turned 30.

The 71-year-old supermodel marked her 1984 milestone birthday by climbing a mountain and, after realising she felt the best she'd ever felt despite warnings her career would be over once she entered her 30s, she made a promise to herself.

She told People magazine: "I was literally told you will be chewed up and spit out by 30...

"I stood at the top [of the mountain], thinking I've never felt better in my life. And that's when I decided to kiss the numbers goodbye because I wasn't going to let them define me."

Christie has "dabbled" with fillers but doesn't want to look to "done" and most procedures she undergoes now on her skin are ...