You have mentioned before that you have the classic mature hairline. Would it be possible for you to post a good size photo of yourself to get a better example of how deep the mature hairline is?
There is no secret to a mature hairline. If your hairline seems too high for you, then it is too high for you (mature or not). The real issue is whether you are balding (getting a higher hairline over the months and years) and if you want to do anything about it. Keep in mind that a mature hairline is usually about one finger width above your highest forehead wrinkle. This isn’t necessarily a hard rule, but it generally works out that way.
Upon your request, here is a photo of myself (click to enlarge):