2 years is about time to replace. If you find cheaper than original and good quality (just look for proper length) - 1 year is reasonable period to change rubbers.
This is the old rubber insert from rear wiper.
It has little cracks and when I pulled it, the main cleaning part came apart from the rubber base.
Also interesting that on plastic holder you can see it says "450-550 L". Length was 450mm and probably it suitable for upto 550mm but you need to replace metal holders with longer ones.
Here are both: the new rubber on top and the old rubber below it.
If you look for details, you can see also production date that is important, because rubber gets dry by the time and you better get newest when you by and can check it.
You can see 2 digits of year ending 08, 09, etc and dots in between. Each dot represents 1 month.
So, new was produced somewhere after 2012, the photo is cutted.
The old was from 2011-03.
32,500 km | 1Y 11M
