What is the opposite of “old school”？
Someone who is old school tend to be a little conservative and traditional”. What is the opposite of “old school”？Is “new school” even a thing？

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Yes, I've heard 'new school'.

'new-fangled' is very American - not said elsewhere. Something to be aware of.

He's 'up to date'/'with-it'/'cool'/'modern' are possibilities where I am. Some are probably local in usage.

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A cliched phrase that an older person who is shocked/annoyed by changes in technology and social rules would use is “new-fangled”.

“These new-fangled phones!”

More generally, “edgy”, “radical”, “provocative” and possibly “punk(rock)”.

Answer

Neo or Trendy