get-off-my-lawn
adj. Cantankerous and old-fashioned or bourgeois, particularly with respect to values or ideas. Also: hey-kids-get-off-my-lawn.

Example Citations:
From there, though, the film turns into a disorganized rant, jumping from Uneeda Biscuits to the Glass-Steagall Act to kids and their infernal text messaging and anything else that occurred to Mr. Hoffman or the seemingly random collection of people he allows to spout off on camera. The whole enterprise has a get-off-my-lawn feel; it tries to pass off whining and a rose-colored-glasses view of the past as insight.
—Neil Genzlinger, "Analyzing History Before the Dust Settles," The New York Times, August 16, 2012

This isn't intended to be a "get off my lawn!" argument, though it is indeed old-fashioned to believe everyone deserves respect.
—Evan Selinger, "Facebook Home Propaganda Makes Selfishness Contagious," Wired, April 22, 2013

Earliest Citation:
When Rumsfeld said in a press conference March 28 that Syria and Iran would be held accountable if they interfered in Iraq, Stewart had material for a comedic rant.

"There is nothing like a cantankerous old man who takes a hey-you-kids-get-off-my-lawn approach to foreign policy," he said.
—Anthony Breznican, "Comics find even war can be laughing matter," The Associated Press, April 8, 2003

Notes:
The idiom get off my lawn, used ironically to indicate that one's arguments or opinions are self-consciously old-fashioned and curmudgeonly, has been in use since at least the early 1990s:

Of course, now that some group of twits or another has decided that milk is bad for you, there will soon be a group called Milkaholics Anonymous.
—Dennis Duggan, "Milk Bashers, Get Off My Lawn!," Newsday, October 11, 1992

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