Rob - two years is not an overly long time to have been learning. Playing patterned fingerpicking after that time is good going. Playing a more complex fingerpicked tune - i.e. where the melodic line is not tied rhythmically or harmonically to the rhythm or the chord pattern requires a much greater discipline. It often pre-supposes a good chord knowledge up and down the fretboard, and the ability to play both hands independently, as in a piano. On those terms, two years is definitely a very short time!

It's always important to practice to a purpose - to set yourself a task, perhaps a phrase, a few bars, a short tune - and then work on that for a while. Then - stop and relax and play something that's not as taxing.

I personally don't think age necessarily has a real bearing on learning. I think determination, a decent instrument and quality time for practice are the main factors. I also think that playing along with someone who is better than you can be hugely profitable. I was lucky enough, as a young chap (40 years ago) to play with two or three absolute guitar wizards who were very generous with their knowledge. But even playing with someone of the same standard as you can be very rewarding as you each pick up on the other's discoveries.

Keep at it and you will get there.