Q: i have just bought this old macbook 13 inch with 10.7.5 software and my iPhone 6 won't sync is there a way i can get it to? it says the iTunes is not up to date but they are on both?

I have just bought  second hand MacBook with 10.7.5 software on it I didn't realise at the time that my iPhone 6 wouldn't sync so was surprised when a message came up saying the iTunes software wasn't up to date I checked for sure and it is up to date on both devices Im not sure were to go from here? do i need to change the software? can i change the software? will this mean i can sync my iPhone to iTunes not this laptop and how do i do it most importantly!