Well I think you have done well and the snake looks lovely, no matter what breed it is (though I think it might be a coastal ) And as long as it is quiet and relaxed, it's age doesn't matter too much - she just may not live for as many years as you would have liked if she is 25. Good on you for taking an older animal and giving it a good home. You will learn plenty as you go along, so don't be afraid to ask questions and don't panic too much about anything .