DS1 (13) does French, Latin, Spanish, Greek and Mandarin. DS2 (6) does French and Spanish.
At their school, they bring in a specialist teacher at nursery level for French, so they've been learning French since they were 3.
Spanish is introduced in Year 2, so DS2 has only been learning that one for a term.
They start Latin in Year 5 and in Year 7 are expected to take one other language from Greek, German, Italian, Mandarin and Russian. The latter two are offered outside of regular school hours only.
We got excellent feedback in DS1's school report about all his languages, especially his French, and his teacher believes he'll be ready to take the GCSE early. According to DS2's report, he is also excelling at French, and (in the teacher's words) "has taken to Spanish like a duck to water."
I'm very proud of them both, especially DS1, because he has to devote quite a bit of his time to rugby (because he's in the elite junior player development squad of a professional rugby club). I have made it clear, his studies are not to suffer, and he's doing me and his dad so proud.
NB: My knowledge of languages is quite poor, so my sons have shamed me into taking recap courses in French and Spanish.