What is the legal ruling on someone who prayed for ten years, then discovered a defect in his purification and prayer that necessitates their invalidity?

The questioner should clarify the nature of the defect in the validity of purification (taharah) and prayer (salat). Based on this, fatwas will be provided explaining the obligatory acts (fara'id) of ghusl (ritual bath) and wudu (ablution) and their nullifiers, the types of purification, and the pillars (arkan) of prayer and its nullifiers. If the defect relates to the agreed-upon obligatory acts of prayer or wudu, or ghusl (such as covering the entire body or intention), then the prayer is invalid, and he must make up all the prayers missed during that period.