Start with the fall you are preventing
An ageing bearded dragon loses the two things his younger enclosure assumed he had: grip strength in his toes and spring in his legs. Tall basking stacks, steep branches, and hammocks hung high become fall hazards for a senior whose climbing is now slower, less certain, and followed by a harder landing on older joints. The most valuable home adjustment is therefore a redesign around ground level: everything he needs daily — basking warmth, food, water, a hide, a cool corner — reachable by walking, with at most one low step. Walk his enclosure at his eye level and remove any point where reaching the heat requires a climb he might not finish.
A basking spot he can walk onto
An ageing bearded dragon still needs proper basking warmth to digest and stay active, so the answer is not less heat but a lower route to it. Replace the tall basking tower with a wide, flat platform — a broad tile, a low stone, or a shallow ramped shelf — that tops out a few inches above the floor, and aim the basking light at that reachable height. Give the approach a gentle ramp with a rough, grippy surface rather than a step up, and make the platform wide enough that he can turn around on it without edging a foot into space. Check the surface temperature on the platform itself after the change, since lowering the basking spot changes the distance to the lamp.
Flooring, dishes, and the daily circuit
On the floor of an ageing bearded dragon's enclosure, firm and grippy beats soft and slippery: a solid textured surface gives his weaker toes purchase and lets him push off to walk, while slick tile or shifting substrate makes every step a negotiation for aging hips. Set his salad dish and water dish directly on that floor with low, wide rims he can eat and drink from without climbing or stretching over a lip, and keep them in the same places every day so his routine is memorised rather than searched for. Arrange the whole layout as one short circuit — bask, walk to food, walk to water, rest in the hide — so a senior with limited stamina never has to cross the enclosure's full length for a drink.
Light, warmth at night, and space to be left alone
An ageing bearded dragon spends more hours resting, so the enclosure's gradients matter more: he must be able to move a short distance to cool down or warm up, because travelling far to thermoregulate is exactly what his body is worse at. Keep a clear warm-to-cool span at floor level, position his ultraviolet light over the low basking platform at the maker's recommended distance for that reachable height, and replace bulbs on schedule since output fades before the light does. Keep one hide on the warm side and one on the cool side, low and wide enough that he enters by walking in, not squeezing.
Watch the new layout like a health check
The weeks after adjusting an ageing bearded dragon's home are diagnostic: a senior who starts basking daily again, eats with his old enthusiasm, and moves around his circuit was being limited by the old layout, and the change has worked. Note also anything the new arrangement reveals — a leg he avoids bearing weight on now that he walks more, or nails growing long because he climbs less. Dragging a leg, trembling when he walks, refusing food for more than a few days, or spending all day in the cool hide despite the easy ramp are reasons to involve a veterinarian who treats reptiles. Once the layout is settled, note its details — platform height, dish positions, ramp side — on his KinsLe profile through Family Sharing, so anyone who deep-cleans the enclosure puts every piece back in the senior arrangement rather than the old athletic one.