Muscle memory is an incredible topic. I won't dive into the science here (maybe on a rainy day in the future) but in general, we know that once our muscles know how to do something, it becomes easier the next time. This applies in some fascinating ways. When you perfect a song on the guitar, forget it, then come back a year later, the song is much easier to learn the second time. Your fingers know where to go. When you train at the gym, it may take you 10 years to reach the level of muscle you're striving for. If you injure yourself, have to sit out for 2 years, and lose it all, it won't take 10 years the next time. If fact, it's significantly shorter. Obviously there are many factors that contribute, such as time spent, nutrition, lifting to failure, etc., but the fact that we really only need to work really hard to achieve something once should be extremely motivational for you. This can apply to other aspects of your life too. Public speaking, playing chess, riding a bike, speaking a foreign language... pick your topic and likely there's a correlation. Put the work in now. You're not likely to have more time available in the future. Most of us tend to get busier as life goes on until we retire. I'm not saying you shouldn't try new things at 65, but please don't wait until then. Commit to the skills and hobbies you know you're passionate about. If you know you're going to master a certain craft in the future, you won't be wasting time by starting now. Personally, I try to practice a little Spanish every day. I'd like to become a proficient bow-hunter, so I started practicing that every once in a while. I intend to write a book, so I've started writing a little bit now. Even if I don't get the opportunity to go to Spain, or go on an elk hunt, or write a book in the next 12 months, I'm still working towards that goal for the future. I won't have to work as hard when I do have a timeline! Lastly, don't let a failure get you down. It might have taken you years to start that first business, but the skills carry over and come back to memory faster each time you start over. Don't give up!