Televisionary: Marsters first hit TV in a Northern Exposure guest spot before coming into his own as Buffy's Spike. He also appeared on such shows as Strange Frequency and Andromeda. On the big screen, you may have caught him in House on Haunted Hill.
Marsters is one of those actors who's so good in his signature role pretty much overshadowing any other Angel or Buffy players doing scenes with him, in my opinion that you'd think he'd get more work than he does. As for his age, his official bio doesn't list it. But he reportedly was born in 1962.