How often do you replace/throw out your underwear?

So

I just read an article that said you're supposed to replace ALL your underwear ever 6-9 months which just had me....

I don't even remember the last time I bought new underwear 🥴

I know I need new ones but I have a hard time justifying buying underwear for myself god forbid a whole new set every 9 months!

Am I a gross human being or is that a ridiculous timeframe?

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