It is extremely difficult to get routine scans with the NHS so your only option is to pay privately.I was denied an Mri after breast cancer treatment at the age of 81 even though I was experiencing pain elsewhere. I was told by the oncologist and by my GP that they would not sanction it unless there were specific symptoms which required investigation. After a year of misery from taking Letrozole and experiencing problems in the pelvis,hands and feet I was finally granted an x-ray and Mri. The latter has uncovered a sizeable ovarian cyst for which my GP is hoping to arrange a referral. 

I think that regular screening should be granted but even if problems are uncovered we face reluctance or refusal on the grounds of age. "Management" with painkillers seems to be the preferred option! I presume the only way around this is to pay and hope for a better outcome. 

My husband had stomach cancer six years ago at the age of 77 and he was told that he would be checked for five years. After a year he had a ct scan which showed no problems. Then he was told he would have no further scans because they caused too much anxiety. The following year he had a brief phone call instructing him to contact the team only if  he had swollen neck glands!! .....It speaks volumes about cancer care especially as he had to have an emergency operation for a perforated and abscessed gallbladder. He is now an invalid who needs my constant care. Obviously older patients are considered redundant!