It's harder to become a pro later in life just because those who have been playing most of their life have something that you will never have...time. It doesn't mean you cant do it, just that they have a leg up. Now I do believe that you can become a pro starting at any age. You just have to love the game and simply play. Not only do golfers have long careers but there is also the Senior tour for those 'getting up there'. Never too late. I'm 25 and literally have been golfing 8 times. I just starting playing and I've already eagled three times and have 1 hole in one. Now I'm not saying I'm a pro or could be one. I'm not even saying I'm that good but it's possible if you REALLY work to understand the game and just golf and apply your knowledge. I feel like I'm pretty good given the short amount of time I've been playing and honestly the key to me learning so fast is studying the game and going in my backyard and swinging. Sometimes at practice balls, sometimes at air. If you can see yourself doing it, you can do it. You just have to put in the work.