What happens to the respiratory system as it ages?

As you age, changes affect your lung tissue, muscles and bones, which all impact your breathing. The maximum amount of air your lungs can hold—your total lung capacity—is about six liters. ... After about 35, their function declines as you age and as a result, breathing can slowly become more difficult over time.

answer; i do believe that the correct answer is (b)

nope, but i have cleaned my brush in my cup of not as potentially harmful but nevertheless, very upsetting for scottish/british folks. especially if you've used the last teabag for it

explanation:

there could be something in that . . i am indeed an old scottish man!

there's a bit of bolshie-ness with it too though. i won't let go of the old ways . . tea and whisky . . whether the young whippersnappers like it or not!