Here you go! The first part is the most important part :)
Older adults have learned how to better cope with stress from life experiences.
Explanation:
It's quite obvious. Older adults have gone through a lot of ups and downs. They are generally calm as compared to people of less age.
(This is very similar to the Dunning Kruger Effect)
Doing enjoying activities
Talking to friends
Writing things down to relieve stress
Mood stablizers i think or benzos