Enoch walked with God 300 years (Genesis 5.22).
Whilst I have not yet met any Christians with such a life span, there are those who belong to The Bridge Church who have been Christians for 40, or 50, or, in some cases, 60 years.
There is huge experience and wisdom in these grey-haired saints.
There remains a window for those younger and younger in the faith to learn from them.
For seniors, the word is to avoid becoming insulated or isolated.