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is this true that a bady RES is hard to take care than an older or is it like that when it gets older him gets more problems.

I think it would seem as if a hatchling would be more difficult because of the high mortality rate and the lack of care they receive from the sellers. If you have a healthy turtle (regardless of size) there shouldn't be any difference in the difficulty in caring for them.

Other than the cost of making sure they have the proper habitat, turtles aren't difficult to care for.. well at least not in my opinion. Expensive yes, difficult no