if the room temp was at 76 it possible that the wort was 80 which could explain the off taste. its more likely to taste green from the temp then from age since its 48 days old. you should also keep it in the fridge for at least 48 hours before drinking it.
put a few bottles in the fridge for a week and try them, see if they taste better. you will have time and cold bottle conditioning on your side.