How can I enlarge my back patio--on a budget?!

We have a concrete slab behind our house (built in 1960's) that is not large enough, not clean looking, and not very useful. I would love to update it, but we are nearly 70 years old and do not have a large budget.
I would love to extend the length of it, change the concrete to pavers (can they be put over the top of the old concrete?), and maybe include some sitting areas. Pretty low-maintenance greenery or flowers would also be nice.

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