In short: He felt Luke wasn't ready. Yoda was the grandmaster of the fallen prequel-era Jedi Order and trained Jedi for centuries, with students typically beginning as young children. He saw too much of Anakin in the young adult, and he didn't want to end up training the successor to Vader.
Yoda's dislike of Anakin was limited to his reluctance of allowing Anakin to be admitted into the Order. He sensed Anakin's fear of loss early on. This could've been helped if Yoda (and the rest of the council) weren't stuck in their traditions that ultimately pushed Anakin further into the Dark side.
But even when Qui-Gon said Obi-Wan was ready, they were still reluctant. The reason Yoda especially was against Anakin being trained was, yes because of his age, but it goes deeper than that. Anakin was too old. Jedi younglings start training very early to be learn to control their emotions and power.
He helped test Anakin's Force abilities, but agreed with Yoda that the boy was too old to be trained. He would always have doubts about Anakin's suitability for the life of a Jedi.
the council thinks Obi-Wan and Anakin have a bond from what they've been through. following his master, Obi-Wan really believes in Anakin and his potential, and will commit fully to training him, where another Jedi might have reservations about taking such an old student.
Master Yoda knew that Darth Vader was once Anakin Skywalker- the boy he sensed too much fear in to train way back in Star Wars: The Phantom Menace.
Sensing the boy's potential, Qui-Gon liberated Anakin from slavery. The Jedi Master presented Anakin to the Jedi Council, but they deemed the boy too old to begin training and dangerously full of fear and anger. They refused to allow Qui-Gon to train Anakin, but rescinded their decision to fulfill Qui-Gon's dying wish.
because his Padawan Ahsoka. never became a knight. She left the order when she was still a padawan. This is why Anakin was denied the rank of master.
Mace completely dismisses him as not just the Chosen One but also a Jedi. He seems particularly spiteful towards Ahsoka, especially when the last time the two interacted, he brushes off as a citizen. Then, he blantantly admits to not trust Anakin.
Billaba became Windu's Padawan and trained under the Jedi Master in the ways of the Force. During her training, Windu allowed her to study Form VII variant known as Vaapad. She eventually became a Jedi Knight, renowned for her skills with a lightsaber and favored Form III when teaching other Jedi.
He dedicated himself to growing in power, ultimately disposing of his master once he had attained sufficient knowledge. And while Yoda and Palpatine both worked with the Senate, they treated each other with the utmost respect.
First and foremost, Obi-Wan didn't want to have to confront and try to kill Anakin, we see this all the way until their final conflict in their duel where Obi-Wan pleads with Anakin to not make him do what he knows he'll have to do if Anakin tries to attack from the low-ground.
In Star Wars: Revenge of the Sith, Anakin probably lost his duel to Obi-Wan on Mustafar because he wasn't using a key part of his power. Anakin's lava-filled duel with Obi-Wan Kenobi on Mustafar is one of the best and most consequential duels in all of Star Wars.
throughout many of the Legends storylines, Vader sought to hunt down every last Jedi. while Palpatine was no longer concerned with the Jedi. Order, in his eyes, Yoda and the Jedi no longer posed a threat to his role. during the early years of the Empire, Palpatine only sent Vader to hunt survivors.
We go for the more simple answer, further considering the details of the question itself. If Anakin didn't go into that chamber as the Jedi confronted Palpatine, then Mace Windu would have defeated Palpatine, killing him. If you remember, Mace had him. He was ready to kill him.
The Younglings Reminded Anakin of How Different He Was
Those negative emotions also power the dark side, meaning Anakin likely felt stronger as he killed the younglings. That, in turn, reinforced his belief that only the dark side could save Padmé.
The showdown on Coruscant was a confrontation that took place in the Supreme Chancellor's Suite of the Galactic Senate in 19 BBY. It began after Jedi Knight Anakin Skywalker informed Master Mace Windu that Supreme Chancellor Palpatine had revealed his identity as a Sith Lord to him.
Mace Windu was a revered Force-sensitive human male Jedi Master and member of the Jedi High Council during the last years of the Republic Era.
For years, Vader hated Obi-Wan, having been struck down by his mentor and left for dead while also believing the Jedi had worked to turn his true love Padmé against him.
Yoda. Yoda was a wise, experienced, and powerful Grand Master of the Jedi of an unknown species and the oldest known prophet in existence (having lived at least 900 years), considered the wisest and most powerful Jedi Master within the Star Wars universe.
With a midi-chlorian count beyond Master Yoda's, Anakin Skywalker surpassed his peers -and even his master- in terms of natural ability, making him the most powerful Jedi to ever live. He could easily take on legions of battle droids, survive the gladiatorial arena on Geonosis, and take on Count Dooku in battle.
Although not technically correct, people would refer to a Jedi that's higher in rank than them simply by calling them master. It was a form of showing respect.
As a consequence of Qui-Gon's error of judgment, and Obi-Wan and Yoda's respect for him, Anakin was unwittingly provided with the tools he needed to become the most dangerous man in the galaxy as Darth Vader.
They were afraid of him. Simply put they saw in Anakin a power so strong they were afraid they could not control him. Yoda had sensed danger in training him, which was true, but I'll address that in a minute. Ultimately the council, filled with fully trained Jedi masters, looked at an untrained child and saw a threat.