Making up a prayer whose performance is in doubt, after thirty years

Question:
May Allah reward you. This questioner says: I left one prayer about thirty years ago, and I was traveling, and I do not remember whether I prayed it or not? Now I am in great distress, so how should I act, and how do I make it up?

Answer:
Make it up, my brother, to clear your conscience. Make it up now, and praise be to Allah. Yes, then you will be at peace.