Picking up the sax at 28 (29 now) has been a challenge for me. Fortunately, my wife has been understanding, but I think the concepts of youth having all the advantages are biased by our observations. Essentially, I practice 3x as hard and 2x smarter than any kid I've ever watched, but when I suck, people are less afraid to tell me so and I'm more able to recognize it. When my tiny neice is 1000x worse on her poorly tuned violin, nobody tells her it is because she sucks. They act like she is queen of the virtuosos because she is tiny.
Little kids are less afraid of being terrible, and far less able to recognize how bad they are. It makes them more willing to slog through the garbage of not being very good at all.
Worse yet, as adults, we often measure ourselves incorrectly. Compared to a kid playing 5 months, I'm super amazing. Compared to a 29 year old who has been playing since 9 years old... I've got a ways to go.
Even worse on that scaling inconsistency is that, as adults, we measure ourselves against those who have "made it" in the sense of becoming relatively famous and successful in their art. Not only are they outlier cases, but fame is biased toward the sensational. Thus, between the 10 year old and the 38 year old who play equally well, the sensational 10 year old is a genius and the 38 year old is an amateur. A blind saxophonist is more sensational than a sighted one. Thus, we tend to observe far more child virtuosos than really exist, making us feel even worse about it.
I'm never going to "make it" unless I define "it" as decent music that comes from me and not my speakers. If I let my music be the end goal, and not compare it to playing duets with Yanni as the headliner, than I'm almost certainly going to make "it" if I don't give up and practice.