In Star Wars: Episode I, The Phantom Menace, when Anakin and Padme met for the first time, Anakin was a 5 year old child, I think. Does anyone know what was Padme's age at that time? After that, they fell in love and married. So what was the age difference between Anakin and Padme?
In 'The Phantom Menace' (set in 32 BBY) Anakin is aged 9 and Padmé is 14. He turns ten during the film.
By the time of their (sexual) relationship in Attack of the Clones, (set ten years later, set in 22 BBY) he was 19 and she was 24 so the age-difference was just 5 years.
The name resonated in young Anakin’s heart and soul. He hadn’t seen her in a decade, not since he, along with Obi-Wan and Qui-Gon, had helped her in her struggle against the Trade Federation on Naboo. He had only been ten years old at that time, but from the moment he had first laid eyes on Padmé, young Anakin had known that she was the woman he would marry.
Never mind that Padmé was several years older than he was. Never mind that he was just a boy when he had known her, when she had known him. Never mind that Jedi were not allowed to marry. - Attack of the Clones: Official Novelisation
As to why she doesn't appear to age (much), I think we can put that down to an excellent moisturisation regime.