Is it gross to not replace underwear every 6 mos?

Anonymous
I live in third world country we were never taught to replace underwear every 6 mos. Im still using my underwear for 6 years. And my underwear are still in good condition. I change my underwear everyday and washes it regularly. Why do we have to replace it?
Is it gross to not replace underwear every 6 mos?
10 Opinion