Should tyre sidewalls appear cracked so quickly?
This doesn't seem like a terrible issue. You should be able to ride on these tires for awhile longer. I've seen people with super cracked tires ride for multiple months without issue. 

Oftentimes, cracks like this happen because of over inflation and exposure to the elements. To keep the tires viable for as long as possible, I would recommend keeping the bike inside when you're not using it, and leaving the pressure between 60 and 80 psi.