can anyone give a debate on a topic silver screen career is very short lived

Such questions need to be attempted on your own to test your creative writing skills. However, these points might help you elaborate:

For:

-career in film industry based on looks and age

-first struggle to establish name 

-then struggle to beat the competition as everyday new and younger faces

-very few roles available for middle-aged and older actors

Against:

-nowadays movies made on different themes

-roles for actors of all age groups available

-number of movies made has increased and so has provision for roles

-actors like Amitabh Bachchan and Helen Mirren have proved that age is no bar for success in this career