I did that a few years back. Maybe five years ago. That would be the last time I mailed personal correspondence.
I first lived in Japan in 1981. Back and forth for several year, then moved there long term in 1990. All of this was before email was common and there wasn’t Skype, so I regularly wrote letters.
Prior to Skype, I started using an cheap calling service back in 1997 or so. That pretty much replaced letters back to the States to my mother. She got email in the early 2000s.
I sent postcards yesterday. A real letter was to my godmother in 2014. She wrote the most beautiful letters. She has an ultimately-fatal stroke a few days later and never read my last one to her.
I’ve sent packets of material in those manila envelopes recently, does that count?
Probably about six or seven years ago, I sort of went on a letter-writing kick. I had posted on Facebook something like, “Anyone remember Gelly Roll pens? Those were awesome,” and a week later, a very sweet co-worker surprised me with a pack of colorful gel pens. I needed some way to make use of them, so I collected some addresses of friends and started writing letters and doodling on the envelopes. They were fairly mundane, but kind of fun and I’ve always loved getting mail.
I should try it again. Maybe even find an out-of-town penpal.
July 2017. My best friend died at 32 and I wrote a letter to his family telling them what their son meant to me as a friend.
When my sister died in May, our last surviving aunt sent me a sympathy card with a handwritten note. I sent her a handwitten note thanking her.
I actually keep a few note cards for such occasions.
If post cards count, I mailed a bunch off a few months ago. Though to honest, there wasn’t as much writing as there was ridiculous stupid pictures drawn.
Pretty sure it was in 1990, Army days. Then until 1992 I was local to everyone. Then I got email and that was the end of writing. I may have sent some birthday/christmas cards until everybody else got on the internet in 1998. Now I hate everybody and I don’t write anything at all. Distance and forgetfulness is healthy for every kind of relationship.
Two letters and a card last week and one letter so far this week. Several of the people I write to a lot are international but a few are domestic. I have a long history with three that goes back 30+ years or more of say at least a letter a month.
A month ago I mailed a letter to one of my sixth grade teachers who I learned was still alive. And she wrote me back.
Last week I started a letter to a close friend whom I have ignored the past few years, but I haven’t finished it yet. It’s a heart-felt message that I think is more worthy of a letter than an email.
I mailed one today! Each week I take the comics and puzzles from the Saturday Toronto Star and send them with a letter to my aunt, who is 90 and now lives in a retirement home in Bruce Mines, Ontario. Last week I also included the puzzles from the Mensa magazine.
My aunt is Not a Computer Person. 
Last week. Having said that, aside from birthday/graduation cards, I think the last one prior to that was probably over 25 years ago.
Annually, I mail local taxes, a couple of race apps that don’t do online, & *maybe *one other thing. Can’t tell you the last year I mailed an actual personal letter, though I do know someone who received one last week; an apology for a colossal screw-up.
I’m 30. I don’t think I’ve ever written an actual personal letter, except for maybe a few times in school when we were practicing writing letters because that was obviously something we’d do all the time as sophisticated grown-ups. I have to admit that I’m fairly taciturn as far as these interpersonal things go, though. I imagine I’d be at the low end for letter-writing in any era.
Last week I mailed a letter. I always mail thank you cards with a handwritten note. I do the same with sympathy cards and birthday cards. The people I send them to always appreciate them. I love getting a note or card in the mail.
I really find it rude that the thank you note is going along the wayside. There have been a few wedding gifts and graduation gifts that I have sent in the past few years that have never been acknowledged. I’d be fine with at least a text or an email.
As a teen, I knew kids all over the country, and we’d all write letters to each other. I went through stamps like water. This was back in the days when long distance call costs mattered, and I couldn’t always afford to pay my parents back, so I wrote instead. Now, any friends and acquaintances at least have email, so writing and paying for stamps is too much of a bother. Besides that, the Israeli postal system is completely untrustworthy, so there’s no real way of knowing if a letter would end up where it’s supposed to be.
About a week after Passover I wrote a short letter/long thank you note to the couple who opened their homes to me on the Seder to share a meal with their extended family (and a few other guests) and sent it through the US Mail so… first week of May this year.
Last week, typed a letter on A4 paper with carbon and onion skin copy, signed it with a dip pen, sealed it with an embossed stamp, put regular postage and a 1967 5 cent stamp on an airmail envelope and sent it off to Germany. True story!
The only personal letters I ever remember writing were to someone I met at a summer “camp” in 1994 when I was 13 who lived on the other side of the state. We wrote a few letters back and forth. Probably only a year later and it would have been email. In fact, we had Internet and email access at that summer camp, as it was focused on technology and at a university. But no one did at home until a bit later.
Me and Daddy had a long ongoing letter writing thing. He died 5 years ago. I was at his house going through stuff when the last letter I wrote him came. Punched me right in the stomach, it did.
We wrote literally 1000s of letters, cards, and quick notes, back and forth…
Haven’t written a letter since.