Mark Seanor, minister to senior adults at First Baptist Church, Hunstville Alabama, uses the term Experienced Adults to name their ministry with adults, roughly 50 and up. Rather than using age divisions, Seanor speaks of life stages (The New Senior Adults Are ‘Experienced’ Adults, lifeway.com):

Builders [or Boomers]
Adults in this life stage range from 50 to 70 years of age. These adults have not retired or are in second and even third careers since retirement. Adults in this division are still “building” and in the prime of their lives. Most have been married for a number of years. Many couples are adjusting to an empty nest. Many of these adults enjoy becoming grandparents for the first time.

Explorers
Adults in this life stage range from 60 to 80 years old. The members of this group are semi-retired or just retired. They have more free time than Builders to travel, to visit family, and to work on hobbies or ministry projects. They are exploring what is next in life.

Pillars
Adults in this stage of life are 70 and older. These adults have been retired for several years and are comfortable with their life stage. Most Pillars are retired, widowed, and yet very active. They face many adjustments due to a growing number of physical limitations.

Homebound and Elderly
Today’s homebound ministry also needs a broader definition than in the past. This ministry needs to include not only those who are elder, but also those unable to attend church or get out of the house due to long-term or temporary physical limitations, illness, or surgery.