There have always been ways to spot someone who is old: white hair, a gray beard, bifocals, references to smallpox. But now, to the chagrin of millennials — the newest batch of elderly people — there’s one that hits too close to home: leggings and tight athletic wear.

Once touchstones for wealth, fitness, and sexiness, formfitting athleisure has become a uniform for the geriatric — allegedly.

Determining what is and what isn’t old people’s garb is Gen Z, the youngest adults on the planet. Even though they will eventually become old themselves, for now, Gen Z determines the trends of fashion. And what they say, according to the Wall Street Journal, a newspaper that’s read by more old people than young, is that now is the time for baggy-fitting sweats and tees and loose-fitting athleisure.

Think: Lululemon stuffing every adjective into its “big cozy ultra-oversized wide-leg pant.” Or Vuori’s “generous” Seaside Sweatpant. Or Alo’s Serenity, a pant that could easily double as a flag or a hammock.

Looking for answers and some outrage, I went to the front lines of where the battle is being fought: gyms, run clubs, group fitness classes, and the social media........

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