Men can father children almost indefinitely?

but women are restricted to a definite time span in the same regard. In other words,a man of eighty or even ninety or more, as long as he is alive, can have sex and have a child as a result, but, a woman is limited to an age span of approx.45 years at the most insofar as her reproductive nature is concerned. So, my question is this. Why call us dirty old men? We love young beautiful women even though we are aged, decrepit old has been who are still ogling young georgeous women. Its in our genes and we are genetically programmed by evolution and nature to act as we do?