What are two reasons that average population age is increasing in developed countries?

They are increasing due to longer life expectancies, because of the increase of technology, and the increase of regulations in the workforce ex. Britian in the Industrial revolution

Humid continental climate is found in the interior of continents between the 30 and 60 degrees latitude, but usually above the 40 degree line.   40 degrees north of the equator means less direct sunlight and therefore less warmth.   this climate is mainly found in the northern hemisphere since there are no major landmasses in the southern hemisphere.  if you live in northern indiana, you know all about humid continental because that is the climate type you have!