Can we draw the following hypothesis from the context? 

Context:

Scott Edward Morriss (born 10 October 1973 in Wandsworth, London) is an English bass player and illustrator, best known as a member of The Bluetones. He is the younger brother of frontman Mark Morriss, with whom he also played with as backing group, The Mummys.

Hypothesis: Mark Morriss, Scott's older brother, was born before the year of nineteen hundred and seventy three.
Yes