Why Are Earth's Oldest Rocks Younger Than Mars's?

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Rocks on Earth are not found to be as old as 4.5 billion years due to geological processes such as weathering, erosion, and plate tectonics, which continuously recycle the Earth's crust. Over billions of years, rocks can break down into sand, dirt, or dust, or they may melt and be transformed into other rock types. In contrast, Mars has a relatively inactive geological history, resulting in a surface that has remained largely unchanged for millions of years, with most rocks dating back at least 3 million years. This stability allows for the preservation of older rock formations on Mars compared to Earth.
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Having trouble with some homework. Why are there no rocks found as old as Earth is (apx. 4.5bil yrs)? Why are most rocks on Mars at least 3mil yrs old?
 
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stuff happens
rocks doNOT just sit there
they turn to sand/dirt/dust over 4.5 B Y
melt or get buryed and pressed into other forms
 
Weathering and plate techtonics
There isn't much of Earth's surface that has been surface for 4Billion years.
Mars is relatively inactive, the surface has largely always been the surface.
 

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