9 year old goodyear tires...should I replace them?

I have some 9 year old goodyear all season tires on my 2007 torrent. There is some cracking on the side walls...2 tires are worse than the other two.

I dont know much about tires but I have read 6 years is when you should get new tires. Some sites say absolutely at 10 years.

The treads are 7/32nds and 4/32nds. I am not too concerned about the treads moreso about the age and the cracking on the outside side walls.

Any advice on whether I should get new tires or not would be great. Thank you in advance.
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