>>126999222 (OP)You can start playing an instrument in your 70s and become very proficient. Same for learning a foreign language. The reason people fail to become good at things late in life is because they lack the time or don't dedicate time to the subject.
Even a subject like learning a foreign language, a native speaker is inundated in that language for 18 years of their life 24/7. It's not that adults are worse at learning foreign languages (outside of accents) but rather most adults never put in the time kids do.
Anyone can learn to sight read or improvise on any instrument, at any age.