Fulda Carat Progresso – Ageing symptoms

Hello Have here 2 Fulda Carat Progresso, DOT 0610 in size 195/60 R 14. These were mounted on the HA in May 2010 and then driven again in 2011 on the HA, 2012 then on the VA. Running performance about 30,000 km rather less. The tires now show clear cracks and are totally hard, tend to saw tooth formation and generate noise while driving in curves as well as while braking. The tyre dealer wants to leave the tires at Fulda at the end of the week. he was surprised himself, how porous/cracky the tires are already. Here are some pictures. Has someone already made similar experiences with Fulda tires ? Greeting Ronny