Maximum age for ball python?

OK, I went over to the husbandry forum and read all the guidelines. It looks like I am feeding her much less than recommended, and much less frequently. Also, her heating pad area may be too warm, although I am not sure about that since my digital thermometer only says 100 F when she is lying right on top of the sensor. When she moves away and the bottom of her cage above the heating pad is radiating into free air space the sensor only reads 84 or 86 F. One big no, no - I do use a regular human heating pad with Hi Med Lo settings.

I made the cage myself, with four glass walls to create a 30" x 15" X 18" high cage. The heating pad is under one end of the cage, in a 3/4" air space below the masonite pegboard that forms the cage bottom. The removable top is made of well ventilated plexiglass. The cage is the size of a common hand towel, and that is what she sleeps on. I have several towels, so I can put in a new one and wash the old one whenever she soils a towel. Her hiding box is 9" x 9" x 30", running the full length of the back of her cage. It is a two-story box (4" on each level), with an exit hole on each level and another hole between the two levels. Sometimes she rests with the top half of her body in the upper level and the bottom half of her body in the lower level. There is plenty of room in her hiding box for her to lie on or off of the area above the heating pad, as she wishes.

She has a heavy ceramic water dish in front of her box at one end of the lower level and another very large ceramic water dish sitting on top of her hiding box. It is big enough for soaking but I have never seen her soaking in it - it is there to add humidity.

As far as cage air temps, the area outside her hiding box is about 70 F during summer days, 65 F during summer nites and winter days, and 60 F during winter nites. She often does one piece sheds, especially if I notice she is about to shed and moisten her towel. Sometimes in dry winter months she will shed in pieces and I will soak her in a luke warm bucket of water to remove any unshed skin. She almost always sheds her eye covers. I have only had to fuss over them a few times during her whole 33 years.