John Mahoney was 66 in Dan in Real Life when he played the character 'Poppy'.
That was over 17 years ago in 2007.
In 2018 he died aged 77, starring in 50 films in his career, 1 of those after Dan in Real Life was first released. If he were alive today he would be 83.
In Dan in Real Life, I think John Mahoney looks: