Use this new situation as a way to deepen your relationship with your son.In that vein, why not invite the couple over and get to know Justin yourself? Every other week, Steven Petrow, the author of “Steven Petrow’s Complete Gay & Lesbian Manners,” addresses questions about LGBT and straight etiquette in his new column, Civilities.Even the White House witnessed an intergenerational first family: President Grover Cleveland was 49 when he married Frances Folsom, then 21.

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Many agreed with you and found your son’s relationship objectionable.

One gay man spoke for many when he posted: “I find middle-aged men who date teens of either gender to be emotionally stunted and chock-full of control issues.” Others volunteered their personal stories, often with happy endings.

Armistead Maupin (“Tales of the City”) is 27 years older than his husband; Ellen De Generes has 15 years on her wife.

Then there’s the late novelist Christopher Isherwood and painter Don Bachardy, who had three decades between them.

Civilities is a new column in The Washington Post covering LGBT and straight etiquette.

Dear Civilities: My 19-year-old son (I’ll call him “Tim”) just came out to me.

My husband, Tim’s father, died three years ago, and I think Tim is looking for a father figure. What could a 40-year-old man have in common with a teenager? Should I keep quiet and pray it ends soon or speak up?

Tim starts college this fall, and I am hoping he’ll find a more appropriate boyfriend there. — Name withheld I completely understand your angst about this — who would want her son in the arms of a “predator”?

) Of course, no such list could leave off Donald Trump and his current wife, Melania, 24 years his junior.