Jessica Biel is afraid of aging.

Just don't expect the actress to go all Heidi Montag on herself and get 18 plastic surgeries in order to compensate for that fear.

"I'm starting to feel my knees changing – like, why do I have this pain when I'm running on the treadmill? What's going on with my lower back when I wake up in the morning? I just feel changes," she told the British edition of Marie Claire.

"I'm definitely fearful in a very vain manner about my body aging. But I am really afraid of blades on my face. That freaks me out beyond belief. I would way rather have some wrinkles than have any kind of slice-up going on."

Meanwhile, Jessica Biel - who is dating singer-producer Justin Timberlake - says she is still on the fence about getting married and having kids:

"I feel like if it's an organic way for me and the right time in my life, then, yeah. If it's right, it'll be right – but, at this moment, that seems completely foreign. I tell you, I have so many friends having babies and getting married, and they just want to put me where they are so we can go to nursery together and stuff. I'm like, 'Noooooo!' I'm resisting."