IN my small airport (Albany NY) the worst lines are generally for the earlier flights. They don't start flights until 6 but from 5-6 have the worst lines because every airline has a 6 and most a 6:30 and there are less TSA officers.
If you have a noon flight you rarely have any line at all.
I will also add that if you haven't flown in 8 years that means your not used to going through security, may not know where everything is and how to get there without having to read signs, etc. So honestly I would say you should have 90 min. Especially if you also have to check bags.
I have definitely done my airport with only an hour to spare but that is when I knew I had A list so could skip bag check lines, security would be manageable and knew exactly where I was going.