Eskimos these days live in the US, Canada and Greenland, and all are to some degree given medical support and housing. The scene where the old grandmother, toothless from chewing hides to make them supple enough to make parkas out of, is left on an ice flow to drift away was in the film Nanook of the North, made in 1922 about some Canadian Eskimos, but based on real life observations of Mounties back in the early 1900's.
I don't think elderly toothless Eskimos are left out on the ice any more. They are given false teeth via Medicaid and a place to stay in Old Folks homes.
We know how long people lived if we have their bones and the remains of their dwellings to analyze. It is fairly easy to detect signs of scurvy, goiter, rickets and other dietary diseases, as well as evidence of cannibalism. But it is very =unusual to find the bones and dwellings of those who lived before people had fire. It is likely that all the Indians had fire before they got to the US. Asia and Africa would be where really ancient bones could be found.