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From my own experience, yes.
I moved into a house in 1991, the electric water heater was old but still working. I sold that house in 2015, same water heater, same elements. I tried to flush it once but the drain valve wouldn't budge.
The electric water heater in this house is now 9 years old. I flushed it once when I moved in, got a fair amount of stuff. The second time nothing, so I haven't flushed it since. Maybe I should do that again. I'm on a well but the water is excellent.
My mother moved into a condo in 1987 or 88, gas water heater, She had at least 4 between then and 2013. I found the last one when I checked on the house while she was in the nursing home.
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