May-December Romance/Playing With

Basic Trope: There is a significant age difference between the partners in a romantic couple.
 * Straight: Alice is 25, Bob is 45.
 * Exaggerated: Bob is 18, Alice is 81.
 * See also Mayfly December Romance.
 * Justified: Bob and Alice live in a culture where men don't marry until they're financially secure, but women marry young to improve their chances of safe childbirth.
 * Bob has a fetish for much older women.
 * A royal Arranged Marriage.
 * Alice is a Gold Digger and Bob is a wealthy man.
 * Alice is actually 43, but through some means, looks a lot younger than she really is.
 * They really do love each other.
 * Inverted: Romantic partners are as close in age as possible.
 * Twincest?
 * Subverted: Alice may look twenty years younger than Bob, but she's Really Seven Hundred Years Old.
 * Double Subverted: Then it turns out Bob is Over Nine Thousand years old.
 * Parodied: The bride hasn't even hit puberty yet, and the groom is Older Than Dirt.
 * Deconstructed: The generational differences between Alice and Bob cause strain in their relationship, and they eventually break up to seek partners closer to their own ages.
 * Reconstructed: But Ted and Carol, despite their age difference, find enough in common that their love can survive misunderstandings, and form a stronger bond because of it.
 * Alternately, the only significant difference is their age. For example, the May is noted to be more emotionally mature than her peers, or the December is a Cool Old Person.
 * Zig Zagged: ???
 * Averted: No one in the story dates outside their own age category.
 * Enforced: "Our male lead, Bob Oldguy, is a box-office hit even in his fifties, but we need a younger actress for the female lead to sell the merchandise. How about Alice Ingenue?"
 * Lampshaded: "Isn't she a bit young for you?"
 * Invoked: Fortyish Bob takes classes at the local college in hopes of scoring with sorority girls by flaunting his superior breadwinning skills.
 * Defied: Bob decides not to go out with the much younger Alice after all; it's more sensible to stick with women of his own maturity level.
 * Discussed: "What you want to do, Alice, is look for an older man. The young ones haven't matured enough to be interesting for more than sex."
 * Or, conversely: "What you want to do, Bob, is look for an older girl. The girls your own age are too immature, and only want to date jocks and bad boys."
 * Conversed: "I hope I can still get the young women when I'm Bob Oldguy's age. Did you see the girl they matched him with in his latest film?"

Back to May December Romance, you crazy kids and/or senior citizens, you.