Their exact ages are unknown, but I'd estimate Helen to be about 17 or 18, and Paris to be about 19 or 20.
Helen
The Trojans and Greeks were fighting over Helen (first of Sparta, then of Troy).
Paris then left Oenone (his first wife) and went to Troy. There he was recognized as the king's son. Later he sailed to Sparta and carried off Helen, the most beautiful woman. In the war that followed, Paris treacherously slew the Greek hero Achilles but was himself wounded in battle. He begged help from Oenone, but she was angry because he had deserted her. She refused, and Paris died of his wound.
When Paris was mortally wounded late on in the war by Philoctetes, Helen made her way to Mount Ida where she begged Paris's former lover Oenone to heal him. She refused and Helen returned to Troy, where Paris died later the same day. Sources state that her refusal was based on Paris's betrayal of her and saw his death as a just punishment. She felt betrayed in two ways in that Paris left her first, to reclaim his rightful place in Troy and then second, fell in love and took Helen as his wife and didn't bother about her. But, regardless of both reasons, Oenone still loved him, so when she heard of his funeral, she ran onto his funeral pyre and threw herself in its fire. (From Wikipedia)
Sparta
Paris was the prince of troy who abducted Helen the queen of Sparta. The story goes that Aphrodite, Athena, and Hera where arguing who was the most beautiful. They asked a mortal man and it was Paris. Aphrodite promised Paris the most beautiful women in the world if he said she was the most beautiful. So he did. And the most beautiful women in the world was Helen.
Helen's first husband was Menelaus, the king of Sparta. Helen's abduction by Paris of Troy was the catalyst for the Trojan War.
Helen's first husband was Menelaus (Menelaos - pronounced "meh-neh-LAH-ohs"), king of Sparta. With the help of Aphrodite, she was spirited away by Paris, Prince of Troy and wed to him under their laws.
Oenone was the first wife of Paris of Troy, whom he abandoned for the queen Helen of Sparta.
Paris was not a Greek god. He was the son of the king of Troy and he fell in love with Helen. She was the married Queen of Sparta. Paris abducted her and started a war between the Trojans and Spartans when Menelaus, husband of Helen and King of Sparta went after them. Helen was known in the ancient world as the most beautiful woman of her day. Was this the face that launched a thousand ships? - first line of a poem by C. Marlowe
There were two princes of the Trojan war. The first was Prince Hector. He was married to Andromache and had a son. He was known as the greatest warrior and was protective of his home (troy). Paris the younger brother wasn't a great warrior. He was more cowardly. He fell in love with Queen Helen of Sparta and he was the reason for the entire Trojan war.
Helen
I'm not sure you understand why Helen was in Troy in the first place. In the myth, she was abducted by Aphrodite and given to Paris as a bride because she promised him the most beautiful woman in the world in exchange for his awarding her the Golden Apple. In truth, I think the movie "Troy" captures what is a more likely event: Paris was younger, and likely much more desirable than was Menelaus, King of Sparta. Even though Sparta of the Bronze Age is nothing like the Classical Sparta we think of, Helen had no choice in who she married, so running off with the young Trojan Prince would have been something a spirited young woman might do. So, as you see, her "deserving" had nothing to do with it.
Helen Morris Prince has written: 'Long Will, the first-person narrator in Piers Plowman'
prince wiilium
Some legends say that Paris forcibly abducted Helen; others that she fell in love with him and went willingly. In one peculiar account, originating in Stesichorus and used by Euripides, Helen was rescued by Proteus in Egypt, who substituted in her stead a phantom that sailed to Troy with Paris. Proteus then cared for Helen until Menelaus finally claimed her. In the Iliad and Odyssey, Helen becomes Paris' wife but is in sympathy with the Greeks. She is easily reconciled with Menelaus after the war, and they return to a peaceful life at Sparta.
The Trojans and Greeks were fighting over Helen (first of Sparta, then of Troy).