I did a lesson every month until recently as it was all I could afford. I went solo at 15 hours, did my first solo nav at 20 hours and I'm applying for the skills test after 47 hours. I have been taking lessons once every 2 or 3 weeks since I reached 30 hours and I haven't had a problem.
I found it easy to pick up what I did in my previous lessons but everyone is different. I say give it a try, if you aren't making any progress then wait for a year or so and fly more frequently. You won't know until you try.
Start to read up on the theorey and do the exams when you are 16. That way you won't be held back.
Best of luck!
