I've been wondering about that. I really think it's to emphasize not only how young he is, but also how different he is to Diya.
Diya is cautious, her risks are calculated, her unknowns carefully gauged. She had to be like that, as her only ally when she went to Kesar Mahal, was a young Yash. She was in a vipers' den, and her every move could have finished everything.
Ratan is carefree, bent on adventure, and a potential player. Not that I understand his attraction to that wedding planner, but I think that's to show the contrast between Diya, always dressed beautifully in Indian wear, and the wedding planner in tight, Western skirts. Ratan is surrounded by women he probably feels are bound by royal tradition. Diya is also from that background. To him, the WP is delightfully different, a breath of fresh air.
Mind you, Ratan might have a thing for older women! That WP is easily six to seven yrs older than him...
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