English

I am learning English construction "the same ... as ..." that can be translated into Russian this way "???(??) ?? … ??? ?…" or this way "??? ?? ?????".

I have a few sentences with this construction. I would like you, English native speakers, to check this sentences and answer such questions as:
Are these sentences grammatically correct and can be used on exams ?
Can these sentences be used in everyday English speech ?

I added a Russian translation to all this sentences in case you learn Russian this can be useful for you.

So there are the sentences:

Olga is the same age as Helen. - ????? ???? ?? ????????, ??? ? ????.
Tom is the same age as George. ??? ?????? ?? ????????, ??? ??????.
Your idea is the same as his. - ???? ???? ????? ??, ??? ? ????.
His attitude is the same as ever. - ??? ??????? — ?? ??, ??? ? ??????.
Things are very much the same as before. - ??? ????? ?????? ??? ??, ??? ? ??????.
Sales are predicted to be the same as last year. - ????????????, ??? ??????? ????? ?????? ??, ??? ? ? ??????? ????.
He did the same thing as you. - ?? ?????? ?? ??, ??? ? ??.
Francis is the same age as me. - ??????? ?????? ?? ????????, ??? ? ?.
She gave the same answer as before. - ??? ???? ????? ?? ?????, ??? ? ??????.
She was born on the same day as me. - ??? ???????? ? ??? ?? ????, ??? ? ?.
Sam's about the same height as his sister now. - ??? ?????? ???????? ?????? ????? ?? ????? ???????.
Jensens' house is about the same size as ours. - ??? ????????? ???????? ?????? ?? ???????, ??? ???.
Your arms should be at the same level as your desk. - ???? ???? ?????? ???? ?? ????? ?????? ? ???????????? ?????.
Plants are classified in much the same way as animals. - ???????? ???????????????? ?? ?????? ??? ??, ??? ? ????????.
She met other mothers in the same situation as herself. - ??? ????????????? ? ??????? ????????, ????????????? ? ????? ?? ?????????, ??? ? ??? ????.
The furniture is made in much the same way as it was 200 years ago. - ??? ?????? ??????? ?? ?????? ??? ?? (?.?. ????? ??? ??), ??? ?? ?????? ?????? ??? ?????.
Levin did the same as Stepan Arkadyevitch and took the glass. - ????? ?????? ?? ??, ??? ?????? ????????, ? ???? ??????.
It is almost the same as suicide. - ??? ????? ?? ??, ??? ????????????.
He's the same age as Pierre. - ??? ??????? ?? ???, ??????? ?????.
The young people were the same age as Ludmila Afanasyevna. - ??????? ???? ?? ??????? ?? ???, ??? ? ??????? ???????????.
Three years ago he was in just the same position as I am. - ??? ???? ???? ????? ?? ??? ? ??? ?? ?????????, ??? ? ?.