Age Manipulation (self) – The ability to control your own age. Presumably you could make yourself older but obviously making yourself younger is preferable.
Melisandre appears young but is actually quite old and how old is an object of debate among Game of Thrones fans.
Examples of characters with this power include The Russian (Heroes).
Jimmy Olsen (DC) takes an elixir to become older in Jimmy Olsen #47.
Simon Drudd (Marvel) goes ahead and drinks the elixir of youth with ironic results in Tales to Astonish V1 #10.