Time was 10 in OoT, and in MM many people put him at 12 years old. I think sone time has passed between oot and mm too, at least the time to befriend Malon and be so close she gifted him Epona in the child timeline. Anyway, let's say Time is about 12 when he comes back from Termina, so Time in LU should be around 32!
Wars is kind of a taboo, we don't know his age in HW but I guess at least 18? This would put him between 24 and 25 years old, damn it looks a little bit too much XD
Twilight was "canonically" 17? Though his age wasn't confirmed as far as I know because Nintendo wanted an adult Link for that game, and in LU he says he was an adult when he had his adventure. A gap between 22 and 25... I'd be more towards 22 tbh, to put him exactly 10 years younger than time :)
Wild... if we consider botw only, then he was already 117 and some months old when he woke up in the shrine, his adventure must have lasted more than one year, so he'd be around 118 to 119, if we consider totk, he would be around 123 to 124.
Sky was 17 when he started his adventure, and considering one year of adventure, and the gap Jojo wrote, he would be around 19/20 in LU.
Legend... Alttp happened when he was a kid, let's say 12 because a 10 year old kid couldn't wield the master sword, and the youngest hero we know is Wind, 12 years old when he held it. After Alttp, we have both the oracles, let's say alttp took one year and the oracles together took another one, so 14 years old when he got lost in the sea and arrived in Koholint. I don't know how to quantify this adventure but even if the dream itself lasted only some days or hours, he had surely taken some time to... decide to travel, buy a boat, and go back to Hyrule only swimming and living on a makeshift raft... I'd put him to be at least 15 after Koholint. Then, we know he come back home and decided to "settle down" in his and his uncle's house, take a break from traveling, and instead deciding to work for the blacksmith. I think more than one year must have passed: his job was a routine for him, Gulley was very close to him, and his trees were healthy and with apples (he surely didn't have time to give them the care they needed, I think he found his trees in a bad shape when he came back from Koholint and spent time bringing them back to a good shape) so let's say he was 17 when he met Ravio and albw happened. One year of adventure, and he's 18, one year between albw and LU, I think Leg is around 19 :D
Hyrule is canonically 16 in Zelda 2, as far as I know, his adventure lasted less than one year? In LU he must be 18 to 19!
Four... in MC he was a kid, so I think no older than 12? I've always headcanoned he was 12 in MC. Now, we know some years have passed between MC and FS, and I don't know if Four did FSA or not. In FS, he's at least 14. If he didn't do FSA, he would be around 16, bit I remember he knows Ganon so FSA must have happened, let's add one year and he should be 17.
Wind is canonically almost 14 :)
Twi 22/.../25, more towards 22
