PROPHET MUHAMMAD (ﷺ) said:
The lifespan of my nation is between sixty to seventy, and the least of them are those who surpass that.

PROPHET MUHAMMAD (ﷺ) said:
The heart of an old man remains young in two respects, i.e.,
1) His love for the world and
2) His incessant hope.

PROPHET MUHAMMAD (ﷺ) said:
The heart of an old man remains young with regard to the love of two things:
1) A long life and
2) Wealth.

PROPHET MUHAMMAD (ﷺ) said:
The son of Adam (i.e. man) grows old and so also two (desires) grow old with him, i.e.,
1) Love for wealth and
2) (a wish for) a long life.

PROPHET MUHAMMAD (ﷺ) said:
The son of Adam grows old, but two things remain young in him:
1) Desire for wealth, and
2) Desire for a (long) life.

PROPHET MUHAMMAD (ﷺ) said:
Seek medical treatment, for Allah has not created any disease but He has also created a remedy for it, except for - one disease: Old age.

Narrated Sa`d bin Abi Waqqas:
The Prophet (ﷺ) used to teach us these words as he used to teach us the Book (Qur'an):

O Allah!
1) Seek refuge with You from miserliness, and
2) Seek refuge with You from cowardice, and
3) Seek refuge with You from being brought back to (senile) geriatric old age, and
4) seek refuge with You from the affliction of the world and from the punishment in the Hereafter.

Narrated `Amr bin Maimun Al-Audi:
Sa`d used to teach his sons the following words as a teacher teaches his students the skill of writing and used to say that Allah's Messenger (ﷺ) used to seek Refuge with Allah from them (i.e. the evils) at the end of every prayer. The words are:

TRANSLATION:
O Allah!
1) I seek refuge with You from cowardice, and
2) Seek refuge with You from being brought back to a bad stage of old life and
3) Seek refuge with You from the afflictions of the world, and
4) Seek refuge with You from the punishments in the grave.

It was narrated that 'Urwah bin Maimun said:
"I heard 'Umar bin Al-Khattab say: 'The Messenger of Allah (ﷺ) used to seek refuge with Allah from five things and say:

O Allah, I seek refuge with You from
1) Cowardice,
2) Miserliness,
3) Reaching the age of second childhood,
4) The trials of the heart and
5) The torment of the grave.

PROPHET MUHAMMAD (ﷺ) said:

O Allah! I seek refuge with You from
1) The punishment of the Fire,
2) The afflictions of the grave,
3) The punishment in the grave, and
4) The evil of the affliction of poverty
5) And from the evil of the affliction caused by Al-Masih Ad-Dajjal.
O Allah!
1) Wash away my sins with the water of snow and hail,
2) And cleanse my heart from the sins as a white garment is cleansed of filth,
3) And let there be a far away distance between me and my sins as You have set far away the East and the West from each other.

It was narrated from 'Uthmân bin Abul-'As AthThaqafi that he complained to the Messenger of Allah (ﷺ) about some pain that he had felt in his body since he became Muslim. The Messenger of Allah (ﷺ) said to him:
Put your hand on the part of your body that hurts and say:

TRANSLATION:
In the Name of Allah
I seek refuge in Allah and His Power from the evil of what I find and I fear.

Shakal bin Humaid said:
"I came to the Prophet (ﷺ) and said: 'O Messenger of Allah (ﷺ), teach me a way of seeking refuge so that I may seek refuge by it." He said: "So he (ﷺ) took my hand and said: 'Say:

O Allah, indeed I seek refuge in You from
1) The evil of my hearing and
2) The evil of my sight, and
3) The evil of my tongue and
4) The evil of my heart, and
5) The evil of my semen.

PROPHET MUHAMMAD (ﷺ) said:
Seek medical treatment, for Allah has not created any disease but He has also created a remedy for it, except for - one disease: Old age.

Narrated Abu Sa`id:
Some of the companions of the Prophet (ﷺ) went on a journey till they reached some of the 'Arab tribes (at night). They asked the latter to treat them as their guests but they refused. The chief of that tribe was then bitten by a snake (or stung by a scorpion) and they tried their best to cure him but in vain. Some of them said (to the others), "Nothing has benefited him, will you go to the people who resided here at night, it may be that some of them might possess something (as treatment)," They went to the group of the companions (of the Prophet (ﷺ) ) and said, "Our chief has been bitten by a snake (or stung by a scorpion) and we have tried everything but he has not benefited. Have you got anything (useful)?" One of them replied, "Yes, by Allah! I can recite a Ruqya, but as you have refused to accept us as your guests, I will not recite the Ruqya for you unless you fix for us some wages for it." They agrees to pay them a flock of sheep. One of them then went and recited (Surat-ul-Fatiha): 'All the praises are for the Lord of the Worlds' and puffed over the chief who became all right as if he was released from a chain, and got up and started walking, showing no signs of sickness. They paid them what they agreed to pay. Some of them (i.e. the companions) then suggested to divide their earnings among themselves, but the one who performed the recitation said, "Do not divide them till we go to the Prophet (ﷺ) and narrate the whole story to him, and wait for his order." So, they went to Allah's Messenger (ﷺ) and narrated the story. Allah's Messenger (ﷺ) asked, "How did you come to know that Suratul- Fatiha was recited as Ruqya?" Then he added, "You have done the right thing. Divide (what you have earned) and assign a share for me as well." The Prophet (ﷺ) smiled thereupon.

Narrated `Ali:
Fatima complained of what she suffered from the hand mill and from grinding, when she got the news that some slave girls of the booty had been brought to Allah's Messenger (ﷺ). She went to him to ask for a maid-servant, but she could not find him, and told `Aisha of her need. When the Prophet (ﷺ) came, Aisha informed him of that. The Prophet (ﷺ) came to our house when we had gone to our beds. (On seeing the Prophet) we were going to get up, but he (ﷺ) said, 'Keep at your places,' I felt the coolness of the Prophet's (ﷺ) feet on my chest. Then he said, "Shall I tell you a thing which is better than what you asked me for? When you go to your beds, say: 'Allahu Akbar (Allah is Greater)' for 34 times, and 'Al Hamdu Lillah (All the praises are for Allah)' for 33 times, and Subhan Allah (Glorified be Allah) for 33 times. This is better for you than what you have requested."