How old is Harlan Ellison?
Harlan Ellison is 77 years old (birthdate: May 27, 1934).
This refers to the classic Star Trek episode "The City on the Edge of Forever", in which the line was delivered by Captain Kirk (William Shatner) to Edith Keeler (guest star Joan Collins). While the episode's script was originally written by Harlan Ellison, it was rewritten internally, which famously pissed Ellison off. Whether that particular line was written by him or a later editor, I couldn't say.
What is the title of a movie where people got time on their arm of how long they will live before they die?
That sounds like the movie "In Time". Although the movie was supposed to be an original script, Harlan Ellison filed suit against the producers claiming that they appropriated the idea from his award-winning 1965 short-story, "Repent, Harlequin!" Said the Ticktockman. While there are significant similarities, Ellison eventually agreed that the differences were sufficient to justify dropping his suit and his request that he receive screen credit.