Me.CustomersDataGridView.Rows(1).Cells(3).Selected() = True
this is used to selected a row or a cell in the DataGrid
Me.CustomersDataGridView.SelectedCells(0).Style.ForeColor = Color.Coral
This can used to to change the Style (backcolor, font color, etc....) of the now selected cells.
I am sure you can do the work to figure out which of the ages is the highest.... but this will highlight, or bold or whatever you want to do to that row or cell.
Hope this helps 8-D
Unsolved 
