1,000,000,000,000s = 16,666,666,666m, 40s = 277,777,777h, 40m, 40s = 11,574,074d, 1h, 40m, 40s = 31,688y, 32d, 1h, 40m, 40s So assuming all that math is correct, one trillion seconds is about 31,688 years.
It depends on age. 20s-40s should have about 1,800 to 2,000 calories a day. Over 40s to 50s should have about 1,600 to 1,800 calories a day. Both are assuming active exercise and a healthy lifestyle with a good diet.
The roles of women changed gradually from the 40s to the 70s. In the 40s and 50s women stayed home for the most part and took care of their families. During the 60s and 70s they began to show up more often in the workforce.
One obvious answer is that the 70s came 30 years after the 40s and the quality of the sound was quite different in both time periods. Just like songs from the 2000s have a better quality than the 70s, the 70s had a better quality of sound than the 40s.