Tire sidewalls are cracking. how bad is it?

This is a semi-rhetorical question because it looks kinda bad to me:

https://ibb.co/sCkyFKX

https://ibb.co/DC2mFvw

https://ibb.co/bRF4tRt

https://ibb.co/XDBRxCw

https://ibb.co/crBbK3v

https://ibb.co/zF1WcM2

https://ibb.co/mh9d015

https://ibb.co/1zgzs3G

https://ibb.co/BzW6bhZ

https://ibb.co/5LRyFZn

I live in a very dry climate and park on the street. These tires are 6 years old and probably due to change anyway. but how bad is it?