Is it common for the other members here to estimate a remaining life? I stay away from placing any number of remaining years life, age, etc. during my reports. If a roof is toast or showing signs of age then I report as such, just no estimated life. Roofs hear don't appear to last nearly as long as what I have seen others report from the more northern areas with the roofs here generally doing well to last to the end of the stated warranty. A cheap 3 tab shingle gets about 15 years, an architectural laminate style getting about 30 if your lucky. Of course with frequent hail and wind lots of roofs never get to the end of normal life before getting replaced.