I think as long as the cardio is of low intensity (treadmill walking, light cycling) it shouldn't negatively affect your weights workout too much. I sometimes find I have a great session if I've done cardio earlier in the day (although not immediately beforehand) because it acts as a real thorough warm up (or maybe a bit of CNS stimulation?). However, if you're really hammering at it, hill sprints, sled pulls etc, you might find yourself flagging later on, especially if doing legs.
As far as a two hour workout goes, early on when you're new to lifting you're not really capable of working out that intensely, but once you've been doing it a while you will find out that you can workout a lot harder and therefore your sessions will probably get shorter as they become more taxing.
Remember, you can either lift hard or long, not both.
Welcome to the forum and congrats for starting lifting when most people are thinking of winding down.
And CHILLAX MAN!! Us old folks don't like drama, it upsets us.