Yes,
It's my experience and want to point this could be different in all around world. The idea that i mentioned is one of reason in the country i live at. The physical tiredness ; In reality, a person who does SAP or any other job very likely ignore working for long long hours(10-12 hours) after 40s. Of course, what i say is not valid for everyone. This conversation clearly showed that.
Regards,
Tahir