That's the old standard... I think nowadays it should be about 80-85...
In the old days, it takes about 15-20 years for 1 generation. So by the age of 70, one can almost have grand grand kid or even grand grand grand kid...
Nowadays, I can't laugh if someone passed away when s/he is only 70...
If you can provide the "real" balance sheet for these 2 events, we can judge if they are 面子工程... Data won't lie, bias do lie on how people interpret the data...