In - В начале/середине/конце 80-х.
By - К началу/середине/концу 80-х.
After - (???) После начала/середины/конца 80-х. (Better to avoid though IMO.)
No apostrophe.
As for age ("in my 20s"),...
Type: Posts; User: it-ogo; Keyword(s):
In - В начале/середине/конце 80-х.
By - К началу/середине/концу 80-х.
After - (???) После начала/середины/конца 80-х. (Better to avoid though IMO.)
No apostrophe.
As for age ("in my 20s"),...
It is an exception in Russian that should be memorized. ;)
They are adjectives (or, actually, ordinal numbers) used as nouns. It is a result of cutting off corresponding noun: a phrase "девяностые годы" turns to just "девяностые" for convenience. So such...
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