I’m pretty sure from things you’ve posted before that you’re older*, but from the photos, I’d say around 45.
*Disclaimer: I am 59 and could be misremembering.
You don’t look your age but more surprisingly, I swear to god, I thought you were black all these years.
I’m not even sure why. Bizarre.
I’m 54, and I’d say you were about the same.
Late forties. I’m 32, like everyone else in this thread, apparently. 
I’m 46 and I guessed in the 50-55 range.
This is one of the most interesting things anyone has ever said about me. Guess it speaks to my inner street cred! 
Late 50’s- a little younger than me.
Based on the photos, I’m going with early-to-mid 40s.
I figured the 45-55 range.
You have a roundish face, which makes people look younger. I’m also in that club!
(My intended had a full beard and was mostly gray, despite being only a few years older than I am. I got carded on our first date. He didn’t. Snerk. I told him he was obviously cradle-robbing!)
I think people used to age “harder” than people do now, because life was harder and nutrition and dental care weren’t as good. Oh, and sunblock. We have sunblock.
I guessed 50. I was going to say slightly older, maybe 55, but the hair changed my mind. You have amazingly non-grey hair for someone 61!
I am 56 and have started to go pretty grey, hence my guess that you were younger than me.
This is what I would’ve guessed.
It’s definitely paternal genetics. My mom’s hair got gray and wavy about 20 minutes after she turned 40, and it’s pretty much the same way today. As I mentioned earlier, Dad hardly had any gray when he died at 72. His sisters were older than he and I can’t recall how gray they were because at least 2 of them wore wigs. Unfortunately, that side of the family has very fine, straight hair that thins as we age - I try to keep it layered to give an illusion of volume, but there’s really not much of it.
One of my sisters inherited the maternal hair. She’s younger and graying and she’s accused me of coloring, but it’s been years, and even then, I just did it to be a redhead for a while. It’s just not worth the hassle to me to mess with dye.
On the other hand, I have another sister who loves coloring her hair. In the last couple of years, it’s been fire engine red, lemon yellow, hot pink, lime green, blue with gold, multi-colored, and it’s currently platinum with aqua and coral stripes on one side. I won’t even try to guess what she’ll do next. She’s 50, BTW.
About mid-fifties, which is as good of an answer as I’ll give you given what I’ve seen and knowing how differently people age.
(This is unspoiled, BTW; I’ve only read the parts of the OP not in the spoiler box and I haven’t read any other posts.)
I guessed 56
I’m 42. I guessed 50.
Had I guessed high, I would have kept it to myself.
I can usually tell how old someone is by looking at their hands. I can’t see yours, so I’ll guess 48.
I am 51.
OK, I added a pic of my left hand - it’s harder to take a picture of your own hand than you might imagine! 
Does that change anyone’s guess?
I’m 56 and you look to be about my age.
My guess was 35 to 55; I am 62. When I then opened the spoiler I was a little surprised but not shocked.
after seeing the hand photo, I would change my guess to leave out the age range of 35-45. So my revised guess would be age 46-55.