Old age is not something to be managed. People are old, not by choice, but by natural processes that no one can control. You will be old one day and hopefully no one will see that as something that has to be managed, but if we feed into this negative trend then it is likely you will be seen in that same light. In the meantime, make a positive move away from ageism and remove that attribute from your mental profile of employees who requirement more management than others.