My dad is 71 he had his first heart attack at 34 he has had all bypasses that can be done ,suffered many heart attacks (5) over the years ,they said he couldn't have a stent before too risky ,he had 25% one artery & 75% second artery left . Just had a heart attack and obversely wasn't going to pull though so they decided to try putting a stent in ,it worked ,so he has 1 artery left with a stent now . How long will this stent last ? & what sort of life will he have ?