Hebrews 11:11:

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.

Notes on Hebrews 11:11:

If you follow the story of Sarah in Genesis, you’ll find that she was definitely NOT in faith all along.  At first, she laughed at the promise of having a son.  Then she made all kinds of trouble by fixing Abraham up with his servant girl Hagar.  For a while, she blamed the Lord for being childless.  But finally, she got in faith and had a child.

This should show you that no matter how long you have been in unbelief for the healing of your condition, you can get in faith and get healed.  It’s never too late to believe God!

See also:

Condition: Infertility
Condition: Weakness