Nice to meet you, and yea, it's never too late to do what your heart desires! Most of my achievements came later in life. I'm so pleased you're doing what makes you happy. Very cool that your dad is also learning to play. I'm another one who knows nothing about music theory, but it didn't stop me from using a keyboard for some of my songs, I just had to play the melody by memory instead. A lot of us have taught ourselves guitar. There are so many tutorials on the internet, but I'm sure you'll find your own path. Wishing you all the best!