Two possibilites. One is easy. The other wone takes a bit more work but is
more in line with your exact description. I would go with the easy option.
Easy... You can use data validation. Select the cell in question. Select
Data -> Validation -> Input Message tab. Add your message. When the cell is
selected the message is displayed. The cell must be selected for this to
work.
You could add a cell Comment that would flyout when the user hovers over the
cell.
You could color the cell for user's attention using Conditional Formatting
so when blank it would be colored and after typing the age, it would lose
the color.
Gord Dibben MS Excel MVP
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