Is ablution acceptable when washing the feet by pouring water over the front, then the back, and repeating this with counting silently, or by pouring water more than once in a single pour when using a bowl?

The method of performing both the complete and sufficient ablution (wudu') has been previously explained. The preponderant opinion is that rubbing the limbs after pouring water is not a condition for the validity of wudu' if one is certain that the water has reached them. Washing the limbs three times does not require verbalization, and it is not prescribed to exceed three washes. It is recommended to wash the front part of a limb first when cleaning it, though the wudu' is valid if one washes the back part first.

If the questioner means that they were not praying two years ago while being an adult and of sound mind, then they must repent and make up the missed prayers from the time of puberty. If they mean that they started praying at the beginning of puberty, then there is no issue.