Decelerated Aging

If you had the age of a martian you would age 3 times slower than humans. If you were a one year old child is equal to a 3 year old martian 1x3=3 if you were a 16 year old child it equal to being 48 years old 3x16=48 if you were a 100 year old earthling then you are 300 years old in martian years 100x3=300 that is the final age of a martian life span 300? (In young justice) would you rather age in martian years enjoying 300 years on this planet and would you enjoy being a martian regardless of your color caste?

You would have all their powers along with aging slow.

Nagisa Kaworu (Neon Genesis Evangelion), the son of ultraterrestrial monster known as Adam. Mysterious figure who is also gay and likes music, Kaworu was born to destroy mankind using a combo platter of technopathy, telekinesis and ability to control Evangelions, but ends up crushed by Unit-01 after surrendering.

Spec (Baki), a 97-year-old Florida metahuman capable of murdering trained soldiers upon masses in a split second, swimming underwater 200 metres below the surface for five minutes on a single breath, and destroying Statue of Liberty with his blows. Can also train in a coma.

What will we get upon merging these two characters?

What is the diffrence between decelerated aging and semi-immortality?