I at this age of 65, still have desires for sex though I cannot do much…So I am becoming addict of watching porno films that makes me shy and also some physical stress/weakness. I want to get rid of this habit but things are so easily available on internet now that even though I try to avoid I get attracted again and again…what’s the solution please?

Self control.
If no other family members require net connection and if you do not have any important things to do on net then remove net connection.