"I am old, Gandalf. I don't look it, but I am beginning to feel it in my heart of hearts. Well-preserved indeed! Why, I feel all thin, sort of stretched, if you know what I mean: like butter that has been scraped over too much bread. That can't be right. I need a change, or something."
― Bilbo Baggins (The Lord of the Rings)
"I am still my youthful years of one hundred and thirties thank you."
― Kureha (One Piece)
"I hate to admit it, but I am only a hundred and six."
― Liara T'Soni (Mass Effect)
"I'd rather not say this in front of His Majesty, but I'll have you know I've been alive for decades!"
"Hmph! Well, I've been fighting for this country for over a century!"
― Aisha and Castor (How a Realist Hero Rebuilt the Kingdom)
Though well over fifty years old, Laura Weathermill (Angel) has the appearance of a young woman.
Sir George (Ben 10) is well over a thousand years old.
Grandfather (Codename: Kids Next Door) has been alive ever since the 19th century in the exact same physical state, despite his aged appearance in the 21st century.
Jay Garrick/The Flash's (DC Comics) differing metabolism and connection to the Speed Force slows his aging.
The Flash's (DC Comics) differing metabolism slows his aging.
Due to having her DNA mutated into a plant-like capabilities basing on solar energy, Poison Ivy's (DC Comics) will live longer and aged slower than regular humans, as long as she maintain absorbing enough solar energy
Though chronologically in her late forties or early fifties, Miss Martian (DC Comics/Young Justice) is only sixteen by the Martian calendar.
Romulus (Marvel Comics) is at least several thousand years old.
Remus (Marvel Comics)
Mystique (Marvel Comics) uses her shapeshifting abilities to rejuvenate her cells, slowing her aging process dramatically.
Being over about 200 years old, Victor Creed/Sabretooth's (Marvel Comics) regenerative abilities slow his aging dramatically.
Being well over 200 years of age, Silas Burr/Cyber (Marvel Comics) retained the appearance and vigor of a man in his physical prime due to his accelerated healing factor, aging much slower than an ordinary human.
Born in the 19th century, James "Logan" Howlett/Wolverine's (Marvel Comics) regenerative abilities slows his aging dramatically, as he is over 100 years, yet still in his physical prime.
As a Half-Vampire, Eric Brooks/Blade (Marvel Comics) has a much longer lifespan than a normal human having been born in the early 1920s.
Thanks to the Infinity Formula, Nick Fury (Marvel Comics) remains in his prime despite chronologically being nearly 100 years old.
Due to the effects of the Super-Soldier Serum, Steve Rogers/Captain America (Marvel Comics) is unable to age and will remain in his healthy physical prime.
Inheriting his father's healing factor, Akihiro Daken (Marvel Comics) retains the appearance of a young man in his physical prime despite being over 60 years old.
Wade Wilson/Deadpool (Marvel Comics) ages slower than the average human due to his healing factor.
Due to his time in the Lost Land, Turok's (Turok: Dinosaur Hunter) aging process has been greatly slowed.
Viltrumites like Thragg (Image Comics) have the potential to live for thousands of years and still be in their physical prime.
Jenny Quantum (WildStorm/DC Comics) stopped aging once she reached adulthood.
Due to the potent magic of the Genesis Spell, the Young Guardians cannot physically age past 18.
Tomiko Asahina (From the New World) has slowed her aging dramatically and lived for over 250 years by continually rejuvenating her telomeres.
Like all dwarves, Romilda's (Outbreak Company) aging is static, meaning that her appearance will not change from childhood all the way until she dies, thus making it impossible to tell exactly how old she truly is.