well i have had her for about 7 months and she is about 2.5yrs old 3 1/2 ft and weighs about 3.4 lbs give or take. and i just increased the heat to over 90 on hot and 80 on the cold. im really not sure how old she is but i know for being 3.5 ft and weighing as much as she does she's about 2.5 yrs or a little more.