[Grammar] Better than and Parallelism in a Sentence

[DANAU]

Hi,

Please let me know which of the sentences below is the correct one?

1. Your standard of English is better than when I was your age.

2. Your standard of English is better than I was your age.

3. Your standard of English is better than mine when I was your age.

Another question is on parallelism in a sentence. Can please tell me which of the sentences below is correct?

1. The doctor has treated his wounds and "taken" him to hospital.

2. The doctor has treated his wounds and "has taken" him to hospital.

Appreciate you can share with me the grammatical rules that are applicable to above examples.

 

[jutfrank]

3 is correct.

Some people would use 1 but it's not strictly correct.

2 is completely wrong.

When you have two unrelated questions, you should start two separate threads.

 

[Alexey86]

3 is correct.

Is "at your age" possible?

Your standard of English is better than mine at your age.

 

[tedmc]

Is "at your age" possible?

Your standard of English is better than mine at your age.

No, "my standard (mine) at your age" is not clear.

 

[GoesStation]

Is "at your age" possible?

Your standard of English is better than mine was at your age.

It works for me with one additional word.