A young crested gecko usually sheds in one clean overnight performance and eats the evidence. A senior gecko's sheds get ragged instead: patches linger, toes keep stubborn rings, and the whole process takes days. Ageing skin is thinner and less elastic, older geckos drink and move about less, and both facts make ambient humidity support matter far more than it did when she was three.
Keep the rhythm, raise the peaks
Crested geckos do best with a humidity cycle rather than a swamp: a heavier misting in the evening that pushes humidity high overnight, then a gradual fall through the day so the enclosure dries somewhat between mistings. For a senior with difficult sheds, keep that rhythm but make the peaks more generous — a thorough evening misting of foliage and walls so she can drink droplets and sit in saturated air — and check with a hygrometer at her level rather than guessing from the room. Constant maximum humidity is not the goal; it invites mould and respiratory trouble in a species that needs the daily dip.
Add a humid hide she can choose
The most useful single change for an old gecko is a dedicated humid hide: a shelter placed low in the enclosure, lined with damp sphagnum moss or plain paper towel kept moist, where the air stays near saturation all the time. A gecko approaching a shed will seek it out herself and soak her skin in exactly the microclimate she needs, including for the toes and tail tip that misting reaches least. Keep the lining clean and re-dampened — a grubby hide trades a shedding problem for a skin infection.
Helping a shed that is already stuck
When shed is lingering, a 'sauna' helps more than any picking: a small ventilated container lined with warm, damp paper towel, gecko inside for fifteen minutes or so in a warm room, softens stuck skin so she can rub it away herself on a rough surface like cork bark. Never peel or pull shed for her — the fresh skin beneath an older gecko's shed tears easily and the wound risk outweighs the tidiness. Afterwards, inspect every toe under good light: retained rings of old skin tighten as they dry and can strangle a toe, and toes are where senior cresties lose ground first.
When humidity is not the whole story
If sheds keep failing despite a good cycle and a humid hide, look wider before misting more. Is she drinking — many old geckos lap less, and mild dehydration shows up first as bad sheds. Is she eating her usual repashy-style diet in her usual amounts, since poor nutrition thins skin quality over time. Retained shed that recurs shed after shed, skin that looks sore, dark or crusty, or a toe already changing colour at the tip are vet matters rather than humidity ones.
Jotting down each shed in her KinsLe Pet Passport — how complete it was, whether the hide and sauna were used, how the toes looked after — turns a vague feeling that sheds are 'getting worse' into evidence of what is helping, ready to show the vet if the pattern stops improving.