okres pełnego rozkwitu Englisch:

be in your heyday

Our company had its heyday long time ago.

He should have retired ages ago. He's old and well past his heyday.

That began during their heydays in the ’30s and ’40s.

And so for a startup during the Web 2.0 heyday to actually make a couple of million dollars in their first year of business was a big deal, despite the fact that a lot of people didn’t fully understand or comprehend or care about what we were doing,

We are in the heyday of youth.

The heyday of the Romans is over.