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If the control arm bushes are wearing out regularly then you have other issues old mate - they should last for years, and only replaced once they start looking worse for wear (perishing, cracked,...

Bushes are commonly rubber or other similar material. they allow a bolt or shaft to twist or flex in a hole, but not to rattle. this is kinda good in suspension connections. eg your shock absorbers...

You need to find out so you're not replacing bushes that might still be OK.

If you have a coil spring wagon the front and rear control arm bushes can wear out with time and use, as can shackle...