How many miles to do the timing bell, my car had 121,000 miles on 2005 Mercury Mariner

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
I had a honda at 85,000 miles told me need to have a time bell, and also my husband had a toyota truck needed at 100,000
(1) Answer
100k. get it changed before it breaks and adds about 2 grand to the repair bill.