“For with God nothing shall be impossible.” Luke 1:37
Its interesting that this same scripture was used in speaking of opening the womb of another barren elderly woman. The passage of time between when a prayer is made and when it comes to pass, can create a mountain of impossibility.
Just remember that God records your prayer and sets a time for its manifestation. For this reason, God must be able to do the impossible. He can make time stand still or speed up. He changes times and seasons and can renew youth in the aged. If that doesn’t cover all things, I don’t know what does! All things are possible with God.