“Little by Little One Travels Far” -J.R.R. Tolkien
Time according to Tolkien is a virtue not a burden. Remember things were made to endure in the Shire including ones age. Lifespans in Tolkien’s world are similar to those of the Old Testament. The Patriarchs lived anywhere from 777 years to Methuselah who past away at 969 years. 
Gandalf‘s character had been on Middle Earth some 2,000 years by the time we see him with Frodo. Thorin would have been just shy of 200 years old at the time of Smaug’s arrival and The Hobbit.
The Holy Scripture says of “Time” that a day with the Lord is like a 1000 years and a thousand years a day. 
Up until the the Flood the average lifespan of a man was 912 years. The conditions on the earth allowed for long lifespans but once the Flood came the conditions that permitted long life ceased.
The age of man was progressively declining until it plateaued to around 120 years. And now the average life expectancy is 79 years.