From PEOPLE Magazine Click to enlarge
20

Jordin Sparks

BIRTH DATE: DEC. 22, 1989

"I'm still discovering who I am as a person," says the singer.

A lot of people think I'm still 17 because that's how old I was on American Idol. It's one of those things where I'm permanently in this teenage era! So I'm actually excited to turn 20 because I'm becoming an adult. My parents are kind of scared, because when I was on tour, I started to do a lot more things by myself. I've always been independent, but I usually kept them close. Lately, though, I've been like, "Okay, Mom, come out for the week—but then you gotta go!" At the same time, I don't want to grow up; I'm in my hotel room jumping on the beds, dancing to music by myself, watching cartoons. In terms of beauty, it's great to look and go, "There's only one zit instead of 20!" I've also definitely seen in the past couple of months a more womanly look to my face—which kind of freaked me out. I've heard a lot of people say that, in your 20s, you become okay with who you are. I know a lot of different things that I stand for, but I'm still discovering what I really like. And I'm hoping that in my 20s I'll be able to be like, "Yes, this is who I am."

30

Jennifer Love Hewitt

BIRTH DATE: FEB. 21, 1979

The Ghost Whisperer star says now's the time to learn "to love your body," varicose veins and all.

So far the 30s have been about learning to love my butt. I've finally gotten smart enough to realize it's not going anywhere and it's not going to get any smaller. I can remember being 22 and a cheeseburger had absolutely no effect on me. Now if I eat too much cheese I get swollen. But your 30s is about getting to the point where you just don't give a crap—the cheese was worth it! And for two days if I have to work out harder, what does it really matter? There's also all kinds of unexpected friends that pop up, like varicose veins. When I look down, I'm like, "Where did my grandmother's legs come from?" But it is what it is. I can't take better care of myself, and you learn that you either start to love your body now or you're never going to love it. You also start to learn what it's like to have inner sexiness in your 30s. If I walk around lovin' what I'm sellin', then other people are going to love it too. I'm starting to find my own womanly confidence. I'm going into 31 feeling settled into who I am as a woman, and I'm not making so many apologies for myself.

40

Stacy London

BIRTH DATE: MAY 25, 1969

"Turning 40 is hard," admits the What Not to Wear host. "But I've never been happier."

My 39th year was difficult. I quit smoking, gained 15 lbs. and I was feeling old and heavy. And that led to a bit of an identity crisis: I didn't get married, I didn't have kids—did I fail? But the day I turned 40 I was like, "I'm done feeling bad about this." I learned to embrace my life—and ever since, 40 has been such an awesome time. There is this perfect balance between feeling young and feeling like my life experience is finally kicking in, so that I'm making smarter, bolder decisions. It's funny, though, because in fashion, even though the trend is skirts all the way up to your pupik, I feel sexier when I wear a pencil skirt. Nothing feels long enough anymore. I'm over showing my gams—it's totally inappropriate! And like everyone else, I've got cellulite to worry about. I have to hide that crap! But the same is true at 40 as it was at 20 and 30: When I wear high heels, I feel a zillion times more sexy.

50

Marcia Gay Harden

BIRTH DATE: AUG. 14, 1959

Feeling "free and joyful," the Oscar-winning actress rings in her golden year with a splash.

This year I celebrated by throwing a big bowl on the pottery wheel, then going for a water-ski at the lake on our property in the Catskills and, that night, skinny-dipping under the stars. Just being free and joyful. And that's how I feel about turning 50. I don't feel the stereotypical "waaah!" This year it's about celebrating being a woman and not having any shame. I finally lost the last 5 lbs. of baby weight with hard work—and a drill-sergeant trainer named Robert Jordan. [Harden gave birth to twins Julitta and Hudson in '04.] Maintaining the same weight when you're older, now that's harder—but not impossible. I'm still about a size 8, the same size I was when I was in my 30s. As I've grown older I've really come to love myself and my life. I'm not a hard body. My assets? I've always had good legs and natural cleavage! Have I considered an eye lift? Of course I've considered it, but I don't have anything set. When and if I feel like it, it will be about refreshing something unnecessary, like a perpetual frown line. But in truth I think there is a beauty to aging, and I embrace it.

60

Twiggy

BIRTH DATE: SEPT. 19, 1949

"I've become much more confident," says the modeling icon.

When I say 60 to myself, I think, "I can't be 60!" The number sounds scary. But I don't feel much different inside than when I was in my 30s. My photographs from the '60s are always popping up, and when I see myself back then, she feels like a really nice relative I used to know who's quite sweet—and incredibly young! In my teens, 20s and 30s, I was always very timid and I did what I was told. The nice thing age gives you is that I've become much more confident about doing the things I want to do. Now, if I don't want to do something, can't be bothered. I don't suffer fools anymore. One thing is true about being 60: I put things away for safety, and then I can't find them! It makes me crazy. But I'm not fanatical about my beauty regimen. I moisturize, because my skin is so dry. And I don't go to bed with makeup on—that's a cardinal sin! I'm also totally against injections. I don't like faces that don't move. If women want to have a little nip and tuck, I understand. I haven't yet. At the moment I'm quite happy with how it's all laying—but talk to me in five years.