Michael Fassbender was 36 in X-Men: Days of Future Past when he played the character 'Erik Lehnsherr / Magneto'.
That was over 10 years ago in 2014.
Today he is 47, and has starred in 65 movies in total, 23 of those since X-Men: Days of Future Past was released.
In X-Men: Days of Future Past, I think Michael Fassbender looks: