Which barren woman, beyond the proper age, does Hebrews 11 say conceived by faith?

Answer: Sarah

By faith Sarah, though barren and beyond the proper age, was enabled to conceive, because she considered God faithful.

“By faith Sarah, even though she was barren and beyond the proper age, was enabled to conceive a child, because she considered Him faithful who had promised.”— Hebrews 11:11 (BSB)