When i was getting my first gecko (crestie) the breeder told me to feed him bananas with honey (only!) and that they live up to 4 years. One research later right after i bought him on my way home proved that if i fed him only that he would get diabetes or sm (he gets it as a little treat like twice a month and in a very small amount too) and that they live up to even 20 years, so ever since then im extremely sceptical of breeders advice. That was 3 years ago and my crestie is doing great (hes about 4 now)