Democrats who think Bob Dole is too old to be elected President better think again. EPIC-MRA and Mitchell Communications, independent Michigan-based pollsters, pitted President Clinton against the Senate Republican Leader in a 1996 preference contest. The 1,000 respondents nationwide favored Dole by 50%-44% in the Apr. 19-23 poll. Then the registered voters were told that Dole is 71 and would be older than Ronald Reagan was when elected President. Dole still won, 49%-45%. Seven out of 10 said his age didn't matter.