21 yr old Ball Questions

[Sid07882]

I have a 21 year old Ball Python named Cleo. Recently I've noticed her skin getting a bit loos along the sides. She is and has always been a good eater still taking a small rat every two weeks so I know that isn't the issue. I am unsure what may be causing the issue and how concerned I should be. I understand she is an older snake and I was wondering if this could be age related. Any help and advice would be appreciated.

[Sid07882]

She shouldn't be dehydrated and she'd about 3 weeks ago. I know these can be contributing factors but neither are in play at the moment.