Just because you are a bit older, doesn't mean that God forgot about His promise to you. He is not a man that He should lie ( Numbers 23:19). Whatever it was that He promised to do in your life, He will bring it to pass. To man it may seem impossible but God specializes in the impossible. Keep your Faith.
God Keeps His Promises
When Abram (Abraham) received the promise that his seed would be a multitude he believed. However, when he and his wife Saraih (Sarah) became old, his/their faith wavered. Their faith wavered because they thought like man thinks, which was that Sarah was well past child bearing years, and she was. But God, He made them wait on purpose to prove to them, that "with men this is impossible, but with God all things are possible (Mathew 19:26).
The trying of your faith worketh patience (James 1:3). No matter your age when God fulfills the promise, He equips you so that you can do it. Whether it's going back to school to earn your degree, opening a new business, or beginning the ministry God promised you years ago; with God it's possible.
"I can do all things through Christ who strengthens me (Philippians 4:13).
Be Patient. Be Encouraged. Trust God.