For me, I already have a long story with the music instruments. I played piano as a child, guitar on my own as a teenager. I really enjoyed the time I spent playing.
Now I am practicing playing drums. And I believe I have good results with it. We with my friends are playing The Beatles covers like a band, and all enjoying it.
What i can suggest to adult-learners, is to pay much attention to music, get a good teacher, and play along with the others.