My 6 IPhone indicates that it has latest version, will not upgrade to 13
My IPhone 6+ indicates that it has latest updated version but cannot update to 13
iPhone 6 Plus
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These are the iOS options based on iPhone Model
iOS 13.5—>6S / 6S Plus, SE, 7 / 7 Plus, 8 / 8 Plus, X, XR, XS /XS Max, 11,11 Pro /11 Pro Max
iOS 12.4.7 —> iPhone 5S, iPhone 6/6 Plus, iPad Air, iPad Mini 2, iPad Mini 3 and iPod Touch (6th generation)
iOS 10.3.4 --> Final release supported on iPhone 5 and iPad (4th generation) Wi-Fi + Cellular
iOS 9.3.6 —> Final release supported on iPhone 4S
iOS 7.1.2 —> Final release supported on iPhone 4.