Ian McKellen was 74 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 84, and has starred in 125 movies in total, 28 of those since X-Men: Days of Future Past was released.
In X-Men: Days of Future Past, I think Ian McKellen looks: