According to Imam, why self purification is difficult at old age?

The importance of studying from Imam Khomeini's point of view.

Imam Rida (PBUH)’, the source of knowledge, wisdom

The presence of young people in keeping the revolution alive.

Imam Khomeini advised believers to seek divine assistance

Imam Khomeini advised believers to seek divine assistance while carrying out tasks and said, "God willing, God will help you in performing all worldly and religious duties, and will diminish your pains for the next day."

knowledge of God and His Attributes should leave deep impact on believers, Imam explains

Imam Khomeini through his theological works explains that the knowledge of God and His Attributes should leave deep impact on believers and faithful people

World is a path to be followed to reach the destinations, Imam Khomeini highlighted

According to Imam Khomeini, the whole world is not the ultimate goal before the Prophets. Rather, it is a path to be followed to reach the destinations which is the high grade of humanity. If a creature reached that high human grade, one will achieve a happiness which is not limited just to this world. The ultimate goal is the world behind this one.

What stages the spiritual travelers will have to observe for self purification?