Tobias Menzies was 24 in Longitude when he played the character 'Halley's Secretary'.
That was over 24 years ago in 2000.
This was his first recorded movie acting credit (although may not technically be his first actual acting role).
Today he is 50, and has starred in 29 movies in total, 27 of those since Longitude was released.
In Longitude, I think Tobias Menzies looks: