I'm in my 40s and a mixed bag.
Generally during intercourse, I finish within the usual few minutes. Seems to be no sign of cumming and then there's a surge and job done.
Once I've cum once, I have far more control. I believe the desire isn't there quite the same and it also has the bonus of letting me concentrate fully on the woman without fear of finishing too quickly.
Cum wise, it varies.
Sometimes there can be loads, a few drops, thick, watery, spurting a few feet, dribbling out etc.
Sometimes if there's a lot of anticipation leading up to a punt / meet, I get a lot of erections and produce a lot of pre-cum. Other times, next to none.
If I refrain from wanking for a few days, it can be thick or watery. No consistency from a few days of abstaining.
This makes no difference to how long I take to complete.
I have times when I'm watching porn, searching AW or reading stories and I get really turned on and may have 2-3 wanks in an hour or less, with things requiring a bit more effort every time and the amount decreasing.
I've had times where I produced loads from wanking and then had sex a couple of hours later and plastered her with loads of thicker cum rather than a dribble that I was expecting.