As said before, the natural lifespan of a human is about 30-40. All the crap like dementia, menopause, arthritis is just a result of us exceeding our natural lifespan.
I’m sure there are a lot of creatures who experience a rapid period of growth after birth. In fact, compared to other mammals, humans develop quite slowly and are dependant on parental support for most of their child years. Compare this two creatures like dogs and lions who can be out living for themselves in a year.