Your age isn't a big deal, i am 58. and i go west some place every year, i have found riding a bike is the best thing for me to get my legs in shape.
with the Weather it doesn't matter what Season you go for, when your in the Rockys,, it can and does change fast, my first hunting trip to CO was in 1986, Mid September, we camped at 10,500' the weather was nice, on the 3rd day a storm moved in, started with rain and it was about 70 degrees out, with in a hour the temp dropped to about 30 degrees and there was a foot of snow on the ground.
camping at 10,500' was my first mistake, try to keep your camp in the 6000' to 7000' range.
You will love it out west, there is nothing like, and if you go once, you will be hooked for life. i don't even deer hunt here in MI anymore, if i can't be chassing a Elk i don't even want to hunt.
As i was reading thru your thread i saw something about getting along with a hunting partner.
There are 3 things that i tell anyone that hunts with me.
1 - i am not the maid everyone helps around camp. you would be amazed how lazy some guys are.
2- No Drugs period.
3- no drinking during hunting hours, when we are done hunting for the day if some wants a beer that is fine.
if you have question i will be happy to answer what i can.