He is a potential companion in Dragon Age: Origins - Awakening and a companion in Dragon Age II. In the latter, he is also a romance option for either male or female Hawke.

How old is Anders in da2?

Anders: Anders was taken to the Circle when he was 12. Irving was First Enchanter at the time, meaning that must have been sometime after 9:10, when he took the position. This means Anders can't possibly be older than 33, probably born between 8:98-9:02. That would make him 29-33 years old.

Is Anders in Inquisition?

In Dragon Age Inquisition, Anders' role is next to nill. Varric will comment that mages soon blamed him for becoming fugitives, forcing him to move on. Varric doesn't know where he is or what happened, adding that he doesn't care.