1 Tim. 5:9-10 (ESV)
Let a widow be enrolled if she is not less than sixty years of age, having been the wife of one husband,  and having a reputation for good works: if she has brought up children, has shown hospitality, has washed the feet of the saints, has cared for the afflicted, and has devoted herself to every good work.
Enrolled for? Commentaries vary. It seems to me though that this is not enrolled on the list of those worthy for charity. As it would not be a very Christian thing to do to deny a person charity based on the fact that they are not old enough. And if she has brought up children, then Paul would have her children take care of her according to the previous paragraph. It seems to indicate that they would be enrolled as perhaps a special order of deaconesses, dedicated to work in the church. At sixty, I suppose, they are not as likely to be distracted from vows and work at the church by other obligations.