Items like this do exist. Check out the aging animals in oasis :)

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This would be very cool :P I'd like to see a cub age up alongside a tree. The plant could grow when the cub is close to aging into important events like being independent or being an adol close to an adult.

Ex- nursing cub-- tiny, tiny sprout in the ground
Four months old-- tree has noticeably grown, is now thicker-stemmed and is a little shorter than the cub
Five months-- first branch begins growing
Eleven months-- first branch is now like the main trunk at four months; tree is taller
One year, one month-- second branch begins to grow
One year, five months-- second branch is now big; leaves are sprouting more, especially on the first branch
Two years-- the tree is now identifiable as a grown tree. Bark and many leaves appear, third and fourth branches begin growing
Three years-- tree is very big now, branches and trunk are thick and stable
Five years-- tree has many branches and leaves
Seven years-- tree is massive, takes up good portion of background
Ten years-- fallen leaves around the tree, some leaves are slightly shriveled
Two months prior to lion's retirement-- bark is darker
Lion's retirement-- tree is now a trunk on the ground

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