Ahadith on "youth" contradicting the Noble Quran

(1) Does the look of one's face make that person bad or good? Here is a Hadith on the young and old. I have just two words to describe it - crazy 'n' funny.

The following hadith falsely attributed to the Prophet (S) says: "the Messenger of Allah (s.w.a.) has said: 'The best of your youth are those who resemble your old people and the worst of your old people are those who resemble your young people.' ”
I'm not sure who has narrated or written the above Hadith.  It has the style of a typical Sunni Hadith and most likely it's been narrated by Abu Huraira as I've read several narrations of his expressing his obsession for being youthful.  Bukhari and al-Muslim Hadiths are full of Abu Huraira's insane babblings on "youth."  So the above narration is surely from one of those collections.
I'm also sure you must have already perceived the gaping discrepancy of this Hadith.
Allah makes the face of each person the way it pleases Him. There are some people who age well (without undergoing any cosmetic procedures of course) while some age fast and at a fairly young age may look a lot older than their age. Either way, spiritually and morally it carries no significance. A person having good age but looking younger or young can be a very sincere believer, and someone young but looking middle aged or older can have a weak faith and the character of a jerk.  So, the above quoted hadith is senseless rubbish.
And now read the following one. It's from the collections of Bukhari, al-Muslim, Tirmidhi and Bayhaqi. It clearly contradicts the one quoted above .... hadith contradicting hadith.
'God does not judge according to your bodies and appearances but He scans your hearts and looks into your deeds.
(2) The following two false hadiths not only contradict the Quran, but also apparently contradict each other. Another case of hadith contradicting hadith.
Bukhari Hadith 4:538. The Messenger of Allah (s.w.a.) has said: “The person who seeks knowledge while in his youth is similar to the act of inscribing something upon a rock; while the person who seeks knowledge while he is old is similar to the act of writing something upon the water.”
This hadith insinuates that seeking knowledge at a young age is far more useful because it stays as part of one's character permanently, while seeking knowledge at an old age cannot be retained for long. Thus, it refers that quest for knowledge at a young age is more positive.
Now check the other one below. Not sure exactly which collection it belongs to, but most likely Bukhari and al-Muslim.
The Messenger of Allah (s.w.a.) has said: “If a person who does not seek knowledge while he is youth, but rather goes to seek it when he becomes old and dies in this state, he dies as a martyr [Shahīd].”
As we've seen, just now one hadith stated that obtaining knowledge at a young age is better and now another one says that even if a person does not seek knowledge when young and instead seeks it at an old age will make him a martyr on his death.
A Hadith fan might try to justify this saying that it refers to the efforts of an old person seeking knowledge despite the fraility of old age and that's why calls him a martyr at death. Okay fine, but neither of the two hadiths hint on "efforts" of elderly people. The first one clearly insinuates that it's pretty useless for an old person to seek knowledge because they won't be able to retain it (probably because memory gets weaker with age). But the second one head-on applauds an old person seeking knowledge to the extent of making him a martyr when he dies .. even if he neglected his duty of acquring knowledge when young. This is surely confusing for readers. It's damned confusing for me. To conclude, my question would be - does the Hadith consider it worthwhile for old people to seek knowledge or not? Yes or no. Can any hadith doctor reading this post come up with an answer?
(3)   Another "youth"  hadith totally contradicting Surah Al-Kahf.  From the name of the narrtor, I presume that it's a Shiia hadith.
Imām Ja'far ibne Muhammad as-Sadiq (a.s.) said the following to Sulaymān ibne Ja'far Al-Hadhalī: “O’ Sulaymān, what is meant by a young person [Al-Fatā]?” He said, “May I be sacrificed for your sake. In our opinion, a young person [Al-Fatā] is a youth [Al-Shābb].” The Imām said to me, “However you should know that surely the Companions of the Cave [Aṣḥābul Kahf] were all old people, however Allah refers to them as youth who have true faith?! O’ Sulaymān, the one who believes in Allah and has consciousness of Him is a young person.”
Another narration by the same narrator on the same topic says:
Imām Ja'far ibne Muhammad as-Sadiq (a.s.) said to a man: “What is meant by a young person [Al-Fatā] in your estimation?” The man replied, “A youth.” The Imām (a.s.) replied, “No, the young person [Al-Fatā] is the true believer. Surely the Companions of the Cave [Aṣḥābul Kahf] were all old people, however Allah, Glory and Greatness be to Him, called them youth who believed in Him.”
The above Hadiths are based on an incident mentioned in Surah Al-Kahf  (The Cave, 18th Chapter of the Quran) from Verses 10 to 26. It's about a group of young believing men who (along with their pet dog) escaped persecution from the disbelieving people of their community and sought refuge in a cave where Allah protected them and their dog for a very long time. Allah clearly mentions of them as "young," that is, young of age. Allah gives us no reason to think that these believing people who hid in the cave were old and referred as young on grounds of their piety, as presumed by this hadith narrator. Please check Verses 10 to 26 of this Surah and see for yourself if there are any references to their being old.  None at all. Secondly, unlike the views of the hadith writer, Allah gives us no reason to think that earthly youth is something better than being old. Allah does not refer nor hint anywhere in the Quran that a believer (regardless of age) always remains young or youthful in the Sight of Allah. The ideas expressed in the above ahadith are only the figments of imagination of this imam .. and certainly not truthful.