I've often heard that phrase used especially in relation to sport. I have also seen it attributed to music.
So what do you think a modern era is and do you think it has a limited time span?
Here is one interweb definition.
modern era - the present or recent times
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Take me back to the swinging sixties with Syd and Baz.
That was a modern era.
This one is just BB via electronics and spying.
I've often heard that phrase used especially in relation to sport. I have also seen it attributed to music.
So what do you think a modern era is and do you think it has a limited time span?
Here is one interweb definition.
modern era - the present or recent times
The 1990's onwards? The Digital age, home computing and the internet, game consoles that didn't take 3 weeks to load.
Sport - Sky/Subscription channels moved the goal-posts (literally). For some it would seem football started with the arrival of the PL, Rugby was moved to the summer, and boxing became a minority sport watched by thousands rather than millions overnight!
Take me back to the swinging sixties with Syd and Baz.
That was a modern era.
This one is just BB via electronics and spying.
How very true Velvet 
The jive was jumping in those days 
I bet Baz
In the context of music it tends to mean the age of recorded media (anything from 1900 really) or the post war era, when records overtook sheet music and radio and TV media promoted music or when music started to be specifically marketed at 'teenagers' as a consumer group.
I agree with Cold Sweat, in the context of football, it really means post war, or alternatively, since the abolition of the maximum wage or the start of the Premier League. You take your pick I suppose.
In the context of politics, any time since Parliament started to tell the monarch what to do or when universal voting was granted or the post war.
In the context of media, photography, radio and the telegraph or the introduction of TV or the availability of the internet. You take your pick!
In the context of technology, the industrial revolution, appliance of electricity, the internal combustion engine, instant communication, nuclear energy, the space age, the first computer, the first transistor. So fairly open to interpretation I'd say.
Post WW2 seems to be a dividing line in many instances.
