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Size and longevity

A simple question from an amateur.
Some species tend to live long lives and grow during their entire life
cycle. Examples may be sharks, eels, and some snakes. These animals can
live long lives and their growth may only be limited by food and other
environmental factors. My question is whether this might have pertained
to some or all dinosaurs. Were they growth limited? Could some of the
large sauropod species such as seismosaurus or ultrasaurus simply be
extremely long lived, very big, and old sauropods that simply excelled
at living life to the fullest? The same question applies to T-rex et al.
Is there any evidence or documentation as to how large these animals
could have gotten if they survived long enough and had abundant foods?
This was a question posed by a student during a dinosaur talk to
elementary students.