Yes, I believe Edward could have been born anywhere from 1780-1795. I originally thought his birth was 1795 actually, but yesterday I was at the local historical society and I was looking through the Taunton, MA directories, and it is listed that Edward could have been born a bit earlier than that, say 1780/1781 which gives me the vague 1780-1795 birth range.
His father was John, but his mother is actually Martha, not Marsha. I saw a better image of Edward's death record and the writing under parents names definitely shows a "T" rather than an "S" in her name. I am fairly certain Edward (B: 1780-1795) & John Rountree (B: 1802) are brothers, but have no records showing it to be fact. All I know is they immigrated from the same area/time frame in Ireland to the same area/time frame in Taunton, MA. They could be first cousins just as easily as brothers, so I don't want to jump to conclusions.
The frustrating thing is I cannot find any records about Edward (B: 1780-1795) in regards to birth, marriage, or immigration records, his supposed wife, Bridget Marren I cannot find any birth, marriage, immigration, or death records on, his supposed parents, John Rountree & Martha (unknown surname) Rountree I cannot find any birth, marriage, immigration, or death records on. I don't know for certain of anything listed for them and Ancestry doesn't have any records fitting the bill when I do an all collections search. Do you know of any good Ireland sources for Birth/Marriage/Death/Burial records? I don't believe Edward's parents ever made it to the USA, so that would have to be where I look I suppose, but any help would be fantastic.