As a result, oceanic lithosphere is much younger than continental lithosphere: the oldest oceanic lithosphere is about 200 million years old, while parts of the continental lithosphere are billions of years old. Oceanic lithosphere is less dense than asthenosphere for a few tens of millions of years, but after this becomes increasingly denser than asthenosphere.

We have a new and improved read on this topic. Like the space above us is divided into layers, the Earth below us is also divided into layers with the core being the innermost layer.
The thickness of the mantle part of the oceanic lithosphere can be approximated as a thermal boundary layer that thickens as the square root of time. Journal of Geology. The rocks in the asthenosphere are not as dense as the rocks in the lithosphere. It is said to be hotter and more fluid than the lithosphere. Oceanic lithosphere consists mainly of mafic crust and ultramafic mantle (peridotite) and is denser than continental lithosphere, for which the mantle is associated with crust made of felsic rocks. [7] The temperature at which olivine begins to deform viscously (~1000 °C) is often used to set this isotherm because olivine is generally the weakest mineral in the upper mantle. When a continental plate comes together with an oceanic plate, at a subduction zones, the oceanic lithosphere always sinks beneath the continental.

Lithosphere has a depth of about 80 km to 200 km below the Earth’s surface. "[6] They have been broadly accepted by geologists and geophysicists. [15], Geoscientists can directly study the nature of the subcontinental mantle by examining mantle xenoliths[16] brought up in kimberlite, lamproite, and other volcanic pipes. Properties of the lithosphere and asthenosphere. {\displaystyle h} Therefore, represents a rheological boundary, i.e. The characteristics of the asthenosphere, on the other hand, is described as mostly solid with partially molten rocks that give it a semi-fluid texture. According to Barrell [ 1914], the lithosphere is 100 times stronger than the asthenosphere. The asthenosphere is solid upper mantle material that is so hot that it behaves plastically and can flow.

Oceanic lithosphere is less dense than asthenosphere for a few tens of millions of years but after this becomes increasingly denser than asthenosphere.

This indicates how strong in your memory this concept is. The lithosphere is the tectonic plate and consists of crust (continental and oceanic), Moho line, Upper Mantle Rigid.

This thickening occurs by conductive cooling, which converts hot asthenosphere into lithospheric mantle and causes the oceanic lithosphere to become increasingly thick and dense with age. They are solid except for the half molten rocks that give it a semi-fluid flow and can follow all the properties of plastic. [2][3][4][5] The concept was based on the presence of significant gravity anomalies over continental crust, from which he inferred that there must exist a strong, solid upper layer (which he called the lithosphere) above a weaker layer which could flow (which he called the asthenosphere). The lithosphere provides a conductive lid atop the convecting mantle: it reduces heat transport through the Earth, A lithosphere (Ancient Greek: λίθος [lithos] for "rocky", and σφαίρα [sphaira] for "sphere") is the rigid,[1] outermost shell of a terrestrial-type planet or natural satellite that is defined by its rigid mechanical properties. The lithosphere is divided into two parts: crust and the uppermost solid mantel layer. This fluid flow of the components of the asthenosphere is the reason for the movement of the tectonic plates.

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