Advice for Young Singers ... From Me

I was just jogging and wondering about ballet versus voice.  I found you have to know piano to do voice eventually because it's gonna be songs you don't know...  Like, you have to play out the melody or something.  I was thinking about a YouTube I was watching of someone who does both piano and voice.  I think I would not keep up piano because even if you did want to be a piano star, too, it's more about talent than like you think in ballet did you do it all the time from age such and such to age such and such.  If you wear yourself out as a person, you won't be happy.  People start things late and get good at them.  I'm not sure what the records are, though, on this matter.