Well i'm probably the youngest here, i'm only 17, but started when I was 14. And at that time they said I was the worst student going and I shouldn't fly, and don't think any of the instructors wanted to fly with me either. Then I stopped flying for 2 years. Just recently over the summer, I completed my PPL in america with first time pass in like a month and a half. So I think its about determination and not about age or skills, as its only a PPL, its a license to learn as my old instructor used to say. So don't stop yourself, go and get a new flying school or instructor, that would probably help.
Take Care and Good Luck.
Brian304