Welcome to healthcare Magic!
It looks like the elderly gentleman is sick from quite some days because he is having chest pain
and breathlessness something serious may be in the chest only.
It can be a tuberculosis
, a malignancy or a congestive heart failure
You should get him examined and helpful investigations would be CBC,ESR,RFT,LFT,Chest Xray, ECHO, ECG and an ultrasound
Please get these investigations and if you like, inform me in a Fresh Query / Follow up Query for further fine tuned opinion
I wish him a great health!