You have lots of time to get in shape.
At age 58, I bought my bike in early April of 1998, and by June 20th I rode a 350 mile 7 day ride over Colorado mountain passes.
The advice you have been given is excellent.
You will find yourself progressing far faster than you think you can.
Be sure to take time for rest. Your body needs to recover. I would not necessarily do intensive aerobic every day. Let your body do the talking, keep a log to demonstrate to yourself your progress.
One day it will all come together, and you will say "Wow, I can really do this."
Be sure to have fun. Don't make it a chore. Make it a pleasure.
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