I'm 32, I started with my piano learning about 6 months ago, I have a lesson once a fortnight.
I don't practice scales or arpeggios (or even know how to spell that without Google). My teacher would like me to, she hasn't forced the issue, I lack the motivation to do them.
The desire to try and play a specific piece of music is what motivates me to practice, each time trying to introduce some new challenge.
I've played a lot of different 'easy piano' music and my sight reading has come along quite well. I have also memorised an emotive song by Enya - which is something I try and play at least once whenever I'm on the piano. I've been trying some Coldplay lately, some of it has been difficult to match up the rhythm with the melody and get my hands work independently - some songs more successful than others.
I started to wonder whether I should continue as I am, or whether I should consider grading.