NET
11 By faith, even though Sarah herself was barren and he was too old, he received the ability to procreate, because he regarded the one who had given the promise to be trustworthy.
Darby
11 By faith also Sarah herself received strength for [the] conception of seed, and [that] beyond a seasonable age; since she counted him faithful who promised.
KJV
11 Through faith also Sara herself received strength to conceive seed, and was delivered of a child when she was past age, because she judged him faithful who had promised.