Seth MacFarlane was 34 in Futurama: Into the Wild Green Yonder when he played the character 'Mars Vegas Singer (singing voice)'.
That was over 15 years ago in 2009.
Today he is 50, and has starred in 40 movies in total, 27 of those since Futurama: Into the Wild Green Yonder was released.
In Futurama: Into the Wild Green Yonder, I think Seth MacFarlane looks: