Nice development track for juniors as well (one example): Opti (under 15)-> F16 (15 - 18/19) -> F18 (18+)-> Tornado (example ages and boats)
Opti until 15? My 15yo is 1.80m and hasn't been able to fit in an opti for years! He's been sailing cats for the last two years, rotomolded relatively slow ones (but with spi). The problem is the lack of cat regatta for kids in the UK, all his regattas so far have been on RS Feva, a two man hiking asymmetric mono because there are no kids regatta on cats in the UK...