How does aging work in the league next season will my horses who are 2 become 3? if so does this mean i will need there 3yo file too? Just not sure if this is the way it works if it is it'd be good to know now as i haven't been saving there files.

Yes, you need to upload the 3yo horse file if you wish to use the same horse next season.

If you tried to upload the 2yo or 4yo horse file next season, TOM would give you an error message.

Ok cheers i just wasn't sure if horses age in the league or not i will try and save horse file for the horses i wish to enter in the league at each age.