Everyone is able and capable to learn to play guitar. It does not matter if your desire comes too late for your age but in reality, age does not matter as long as perseverance and patience is present. If kids can follow each lesson successfully, how much more with adults who have better comprehension and analytical skills? You have options if you would enroll in a formal training with a fixed schedule or have a home service tutorial. Just set a time where you can have practice sessions aside from the tutorial classes.
It’s normal that you commit mistakes during the first few weeks and even months. Later on, as you learn 2 play guitar and practice more often; you will have a keen sense on just properly fretting the strings and strumming with the right tune and music. The heart is the source of motivation to get moving, and playing guitar each day until becoming an expert will raise within you.