Dog years and human years

The prediluvians lived about ten times longer than a normal lifespan for us. That raises the question of whether they aged at a steady rate, but simply aged more slowly, or whether they matured sooner or later, stayed youthful for most of their life, while the pace of aging accelerated towards the end. In that respect it's interesting to compare human maturation/aging with canine maturation/aging:

http://pets.webmd.com/dogs/how-to-calculate-your-dogs-age?print=true