No wonder God promised abraham a child and it seems to be late in human sight before God fulfilled this promise to him, this promise came to pass when Abraham finished/worked in the process God have designed. Though it wasn't late
He also said “I will bless those who bless you, and him who dishonors you I will curse, and in you all the families of the earth shall be blessed.” this doesn't mean there will be immediate effect on our enemies.
God's process/ways are unpredictable

In my language, it is said that what you don't wait for or work for hardly last.

“Ohun ti a o ba jiya fun kii tojo, ohun a ba fara sise fun nii pe lowo eni”