Provavelmente injeções de Jones.
Cole aponta isso dois episódios depois ( 1x13 Arms of Mine ):
Cole: That's Ramse
Cassandra: That's him?
Cole: Yeah. He looks exactly the same. I don't know how that's possible.
Cassandra: Maybe it's Jones's injections. You said... said they make it so time moves around you. Maybe they have an effect on cellular aging.
Depois disso, há aparentemente confirmação no episódio 2x01 Ano do Macaco :
Cole: At least you've got a dose of Jones's injections in you -- it'll help you heal faster and age slower... mostly.
Há menções mais detalhadas de seu envelhecimento no episódio 2x04 Emergence , que parecem apoiar o que Cole disse na citação acima:
Nurse: Well, Mr. Ramse, you're one lucky man. Not many people get hit by a car and live to tell the tale. You have osteoporosis in your arm, which is kind of strange for someone so young. And you heal fast. Like... unusually fast.
e
Gale: Doctors here have a lot of questions about his medical conditions. Like why, uh, parts of his body seem to have aged unevenly.
No entanto, a recapitulação oficial para o episódio 1x11 Shonin tem isto a dizer:
You know what's interesting about Ramse? He doesn't seem to age, which could be some time travel thing or he just has good genes.
e mais tarde descobrimos que a razão para o envelhecimento retardado de Olivia é, de fato, seus genes, embora ela tenha sido geneticamente modificada via paradoxo do ciclo temporal - portanto, esta é uma possibilidade viável (embora muito improvável).