Fumble Fingers, I have taught guitar for over fifty years.

The best way for you to go is to find for yourself the kind of music you want to play and start from there. What songs do you like? What sounds do you like on the guitar?

Once you know this, the information is out there and you can ask questions today and find answers.

Age is not a factor. What does count though is that a propensity for finger dexterity enables certain people to learn faster technically but not necessarilly musically.

The advancement you make is in proportion to the amount of time you want to spend on it.
The best mode of practice is "distributive" rather than "mass". A little at various times each day is preferable to doing a lot on one day and skipping 2 or 3.

Much progress can be made if you keep a positive attitude and interest in the learning process.

Frank Hamilton