Points for the statement:
1. Hormones are at their highest in life, making everything about love and bonding so intense, the hero and heroine can’t get enough of each other. Every moment is treasured and looked forward to with abandon.
2. Experiencing anything for the first time becomes an indelible marker for life.
3. The process of engaging in new ways of living and doing things, breaking old habits (things of a child), makes for unforgettable memories.
1. The kids don’t know what they’re feeling (puppy love).
2. The kids confuse passion or sexual excitement for love.
3. The kids are naturally more egotistical and may not have empathy enough to really know each other.
Personally, although the points against have their lure, the first three for love being forever fit better with scientific studies on the subject.
No matter the portrayal, the writer needs to seriously consider these ideas in developing a romance for any age. At least, the story will have depth.
In the Hallmark movie, in backstory we see the youngerr versions wrestling with going off the college. The hero breaks up, without explanation, in order to not hold back his heroine. Many of us have been there and done that or have heard of such break-ups. BTW, her heart was broken, she blamed him, but oddly he never questioned his decision or at least it wasn't shown.
If I Could Turn Back Time, Cher, 1989.