Chadwick Boseman was 40 in Black Panther when he played the character 'King T’Challa / Black Panther'.
That was over 6 years ago in 2018.
In 2020 he died aged just 43, starring in 27 films in his career, 11 of those after Black Panther was first released. If he were alive today he would be 47.
In Black Panther, I think Chadwick Boseman looks: