101 proofs of a young earth from Creation.Com; top 10 from AiG.

[Xavier]

Creation has an excellent list of 101 evidences for a young earth here, I'm only enlisting the top ten: https://creation.com/age-of-the-earth Highly recommended read, and very powerful evidence the earth is a lot younger than evolutionary secularists need for their atheistic and pagan theory to work.

"I. DNA in 'ancient' fossils. DNA extracted from bacteria that are supposed to be 425 million years old brings into question that age, because DNA could not last more than thousands of years.
II. Lazarus bacteria—bacteria revived from salt inclusions supposedly 250 million years old, suggest the salt is not millions of years old. See also Salty saga.

III. The decay in the human genome due to multiple slightly harmful mutations each generation is consistent with an origin several thousand years ago. Sanford, J., Genetic entropy and the mystery of the genome, Ivan Press, 2005; see review of the book and the interview with the author in Creation 30(4):45–47, September 2008. This has been confirmed by realistic modelling of population genetics, which shows that genomes are young, in the order of thousands of years. See Sanford, J., Baumgardner, J., Brewer, W., Gibson, P. and Remine, W., Mendel's Accountant: A biologically realistic forward-time population genetics program, SCPE 8(2):147–165, 2007.
IV. The data for 'mitochondrial Eve' are consistent with a common origin of all humans several thousand years ago.

V. Very limited variation in the DNA sequence on the human Y-chromosome around the world is consistent with a recent origin of mankind, thousands not millions of years.
VI. Many fossil bones 'dated' at many millions of years old are hardly mineralized, if at all. This contradicts the widely believed old age of the earth. See, for example, Dinosaur bones just how old are they really? Tubes of marine worms, 'dated' at 550 million years old, that are soft and flexible and apparently composed of the original organic compounds hold the record (original paper).

VII. Dinosaur blood cells, blood vessels, proteins (hemoglobin, osteocalcin, collagen, histones) and DNA are not consistent with their supposed more than 65-million-year age, but make more sense if the remains are thousands of years old (at most).
VIII. Lack of 50:50 racemization of amino acids in fossils 'dated' at millions of years old, whereas complete racemization would occur in thousands of years.

IX. Living fossils—jellyfish, graptolites, coelacanth, stromatolites, Wollemi pine and hundreds more. That many hundreds of species could remain so unchanged, for even up to billions of years in the case of stromatolites, speaks against the millions and billions of years being real.
X. Discontinuous fossil sequences. E.g. Coelacanth, Wollemi pine and various 'index' fossils, which are present in supposedly ancient strata, missing in strata representing many millions of years since, but still living today. Such discontinuities speak against the interpretation of the rock formations as vast geological ages—how could Coelacanths have avoided being fossilized for 65 million years, for example? See The 'Lazarus effect': rodent 'resurrection'!"

[Xavier]

And from: https://answersingenesis.org/evidence-for-creation/the-10-best-evidences-from-science-that-confirm-a-young-earth/

The 10 Best Evidences from Science that Confirm a Young Earth
#1 Very Little Sediment on the Seafloor

For Additional Information (please see the link):

The Sands of Time: A Biblical Model of Deep Sea-Floor Sedimentation
The Sands of Time: A Biblical Model of Deep Sea-Floor Sedimentation (pdf)
"Sea Salt, Erosion, and Sediments" from Earth's Catastrophic Past1 (pdf)

#2 Bent Rock Layers

For Additional Information:

Rock Layers Folded, Not Fractured
"Soft-Sediment Deformation Features" from Earth's Catastrophic Past2 (pdf)
"Megasequences of North America" from Earth's Catastrophic Past3 (pdf)

#3 Soft Tissue in Fossils

For Additional Information:

Two: Those Not-So-Dry Bones
More Soft Tissue in "Old" Fossils

#4 Faint Sun Paradox

For Additional Information:

The Young Faint Sun Paradox and the Age of the Solar System

#5 Rapidly Decaying Magnetic Field

For Additional Information:

The Earth's Magnetic Field Is Young
The Earth's Magnetic Field and the Age of the Earth
"The Earth's Magnetic Field" from Earth's Catastrophic Past4 (pdf)

#6 Helium in Radioactive Rocks

For Additional Information:

Helium Diffusion Rates Support Accelerated Nuclear Decay
Young Helium Diffusion Age of Zircons Supports Accelerated Nuclear Decay
The Age of the Earth's Atmosphere Estimated by its Helium Content
"Helium in Rocks and in the Atmosphere" from Earth's Catastrophic Past5 (pdf)

#7 Carbon-14 in Fossils, Coal, and Diamonds

For Additional Information:

Carbon-14 in Fossils and Diamonds
Carbon-14 Evidence for a Recent Global Flood and a Young Earth
Measurable 14C in Fossilized Organic Materials: Confirming the Young Earth Creation-Flood Model
"The Pitfalls in the Radioactive Dating Methods—The Radiocarbon Dating Method" from Earth's Catastrophic Past6 (pdf)
"Carbon-14 Dating" from Thousands . . . not Billions7 (pdf)

#8 Short-Lived Comets

For Additional Information:

Comets and the Age of the Solar System
Kuiper Belt Objects: Solution to Short-Period Comets?
More Problems for the 'Oort Comet Cloud'

#9 Very Little Salt in the Sea

For Additional Information:

The Sea's Missing Salt: A Dilemma for Evolutionists
"Sea Salt, Erosion, and Sediments" from Earth's Catastrophic Past8 (pdf)

#10 DNA in "Ancient" Bacteria

For Additional Information:

Bacterial Life in Ancient Salt