Leghorns aren't very personable though, 'flighty', little hyper.
The laying eggs life of most chickens is only a few yrs. I never heard sexlinks only live 2-3 yrs, yes they are a 'hybrid' but that just means they are a cross of two other breeds, typically rhode island red and barred rock, rir or new hampshire and white rock or delaware.
For kids I'd suggest Easter eggers, kids love those green eggs and they lay quite well.
Leghorns are the best chickens ever. Plenty of personality, and mine loves me
Gary