"O Ka'b! Tell us a Hadith from the Messenger of Allah (ﷺ) and be careful." He said: "I heard him say: 'Whoever develops one gray hair in Islam, in the cause of Allah, it will be light for him on the Day of Resurrection.'" He said to him: "Tell us about the Prophet (ﷺ) and be careful." He said: "I heard him say: 'Shoot, and whoever hits the enemy with an arrow, Allah will raise him one degree in status thereby.'" Ibn An-Nahhan said: 'O Messenger of Allah, what is a degree?' He said: 'It is not like the doorstep of your mother; rather (the distance) between two degrees is (that if) a hundred years.'"

As explained after it; the degree of distance is greater than such a degree in this world.
Sunan an-Nasa'i Book 25, Hadith 60
← Previous Hadith "I heard the Messenger of Allah (ﷺ) say: 'Whoever shoots an arrow in the cause of Allah and it hits the target, it will raise him one level in Paradise.' That day I shot sixteen arrows that hit their targets." He said: "And I heard the Messenger of Allah (ﷺ) say: 'Whoever shoots an arrow in the cause of Allah, it is equal to the reward of freeing a slave.'"

Sunan an-Nasa'i Book 25, Hadith 59 Next Hadith → "I said: 'O 'Amr bin 'Abasah! Tell us a Hadith that you heard from the Messenger of Allah (ﷺ) without forgetting or omitting anything.' He said: 'I heard the Messenger of Allah (ﷺ) say: Whoever shoots an arrow in the cause of Allah, and it reaches the enemy, whether it misses or hits, it will be as if he freed slave. Whoever frees a believing slave, that will be a ransom for him, limb by limb, from the Fire of Hell. Whoever develops a gray hair in the cause of Allah, it will be light for him on the Day of Resurrection."

Sunan an-Nasa'i Book 25, Hadith 61