I learnt basic music theory as a kid but never had lessons. I was in my 20s when I started learning music theory every day and I'm probably around ABRSM grade 5 for performance ability and much lower for theory. I started learning Mozart's K576 which is at least a grade 8 but had to stop because my finger joints started to click which was agonising. I had to stop learning it right before the counterpoint which is what I was aiming for. I learnt pieces by my other favourite composers Chopin and Debussy but haven't played them for so long I would have to start again with the sheet music from bar one. Learning music by Debussy was a unique experience.
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I play Piano, Cello and guitar mostly but I also know a bit of harp, trumpet, flute and oboe 😅😅